- A. Senthil Thilak, Ayyanar K and
**P. Sam Johnson**,*“On the Construction and Properties of Frames Using Incidence Matrix of Graphs and Their Spectra”,*Proceedings of the Jangjeon Mathematical Society (accepted for publication). - Shah Jahan and
**P. Sam Johnson**,*“Frame Operators for Frames in Krein Spaces”,*European Journal of Mathematical Analysis, 4 (2024), Article 1 (10 pages). - K. Mahesh Krishna and
**P. Sam Johnson**,*“Lipschitz p-Approximate Schauder Frames”,*Kragujevac Journal of Mathematics, Volume 50, Number 2 (2026), pages 217-230 (to be published). - K. Mahesh Krishna and
**P. Sam Johnson**,*“Operator-Valued p-Approximate Schauder Frames”,*J. Ramanujan Math. Soc. 38, No.3 (2023), 369-392. - Athira Satheesh K, K. Kamaraj and
**P. Sam Johnson**,*“Algebraic Proofs of Characterizing Reverse Order Law for Closed Range Operators in Hilbert Spaces”,*Eurasian Mathematical Journal, Volume 14, Number 3 (2023), 08-25. - K. Mahesh Krishna and
**P. Sam Johnson**,*“Approximately Dual p-Approximate Schauder Frames”,*Aust. J. Math. Anal. Appl. 20 (2023), No. 1, Article 22, 9 pages. - K. Kamaraj,
**P. Sam Johnson**and Athira Satheesh K, “*Reverse Order Law for Generalized Inverses with Indefinite Hermitian Weights”,*Filomat 37:3 (2023), 699-709. - K. Mahesh Krishna and
**P. Sam Johnson**, “*Dilations of Linear Maps on Vector Spaces”,*Operators and Matrices, Volume 16, Number 2 (2022), 465-477. -
**P. Sam Johnson**, “*Closed EP and Hypo-EP Operators on Hilbert Spaces”,*The Journal of Analysis (2022) 30:1377-1390. - K. Mahesh Krishna and
**P. Sam Johnson**, “*Commutators Close to the Identity in Unital C*-Algebras”,*Proceedings - Mathematical Sciences, Vol. 132, Issue 1, June 2022, Article 11, 08 pages. - K. Kamaraj,
**P. Sam Johnson**and Sachin Manjunath Naik, “*Generalized Principal Pivot Transform and its Inheritance Properties”,*The Journal of Analysis (2022) 30:1241-1256. - Rashid A. and
**P. Sam Johnson**, “*P-Operators on Hilbert Spaces”,*Palestine Journal of Mathematics, Vol.11 (3) 2022, 85-89. - K. Mahesh Krishna and
**P. Sam Johnson**, “*Factorable Weak Operator-Valued Frames”,*Annals of Functional Analysis, Vol. 13 (2022) No.1, Article 11, 36 pages. - K. Mahesh Krishna and
**P. Sam Johnson**, “*The Noncommutative ℓ*Nonlinear Functional Analysis and Applications, Volume 27, Issue 2, 249-259, 2022._{1}−ℓ_{2}Inequality for Hilbert C*-Modules and the Exact Constant”, - K. Mahesh Krishna and
**P. Sam Johnson**, “*Expansion of Weak Reconstruction Sequences to Approximate Schauder Frames for Banach Spaces”,*Asian-European Journal of Mathematics, Vol. 15, No. 3 (2022) 2250060 (6 pages) - K. Mahesh Krishna and
**P. Sam Johnson**, “*Frames for Metric Spaces”,*Results in Mathematics, Vol. 77, Issue 1, February 2022, Article 49, 30 pages. - K. Mahesh Krishna,
**P. Sam Johnson**and R. N. Mohapatra, “*Multipliers for Operator-Valued Bessel Sequences and Generalized Hilbert-Schmidt Classes”,*Journal of Applied Mathematics and Informatics, Vol. 40(2022), No. 1-2, pp. 153-171. - K. Mahesh Krishna and
**P. Sam Johnson**, “*Dilation Theorem for p-Approximate Schauder Frames for Separable Banach Spaces”,*Palestine Journal of Mathematics, Vol.11 (2) 2022, 384-394. - K. Mahesh Krishna and
**P. Sam Johnson**, “*Perturbation of p-Approximate Schauder Frames for Separable Banach Spaces”,*Poincare Journal of Analysis and Applications, Vol.8, No.1(II) (2021), 15-24. - K. Mahesh Krishna and
**P. Sam Johnson**, “*New Identity on Parseval p-Approximate Schauder Frames and Applications”,*Journal of Interdisciplinary Mathematics, Vol. 24 (2021), No. 7, 1751–1760. -
**P. Sam Johnson**, Vinoth A and K. Kamaraj, “*Fuglede-Putnam Type Commutativity Theorems for EP Operators”,*Malaya J. Mat. 9 (2021), No. 1, 709-714. - K. Mahesh Krishna and
**P. Sam Johnson**, “*Towards Characterizations of Approximate Schauder Frame and Its Duals for Banach Spaces”,*J. Pseudo-Differ. Oper. Appl., 12(1), 2021, Article 9, 13 pages. - Athira Satheesh K,
**P. Sam Johnson**and K. Kamaraj, “*Estimates of Norms on Krein Spaces”,*Aust. J. Math. Anal. Appl. 17 (2020), No. 2, Article 18, 10 pages. **P. Sam Johnson**, “*On Semiclosed Operators with Closed Range”*, Canad. J. Appl. Math. 2 (2020), No. 2, 18-22.**P. Sam Johnson**and S. Balaji, "*Convergence of Operators with Closed Range"*, Khayyam J. Math. 5 (2019) No. 2, 132-138.- Mahesh Krishna and
**P. Sam Johnson**, "*Quotient Operators and the Open Mapping Theorem"*, Filomat 32:18 (2018), 6221-6227. **P. Sam Johnson**and Vinoth A, "*Product and Factorization of Hypo-EP Operators"*, Special Matrices 6 (2018), 376-382.- B. Parvathalu and
**P. Sam Johnson**, "*Construction of Mercedes-Benz Frame in R*, International Journal of Applied and Computational Mathematics, December 2017, Issue 1 Supplement, 511-519.^{n}" - G. Ramu and
**P. Sam Johnson**, "*Frames for Operators in Banach Spaces"*, Acta Mathematica Vietnamica, 42 (2017), 665-673. - Vinoth A and
**P. Sam Johnson**, "*On Sum and Restriction of Hypo-EP Operators"*, Funct. Anal. Approx. Comput. 9 (1) (2017), 37-41. - G. Ramu and
**P. Sam Johnson**, "*Frame Operators of K-frames"*, Boletin de la Sociedad Espanola de Matematica Aplicada, SeMA Journal (2016) 73 : 171-181. **P. Sam Johnson**and G. Ramu, "*Class of Bounded Operators associated with an Atomic System"*, Tamkang Journal of Mathematics, Vol.46, No.1, 85-90, March 2015.**P. Sam Johnson**, “*Multiplication Operators with Closed Range in Operator Algebras"*, Journal of Analysis and Number Theory, Vol. 1, No.1, 1-5, 2013.**P. Sam Johnson**and S. Balaji, “*On Semiclosed Subspaces of Hilbert Spaces"*, International Journal of Pure and Applied Mathematics, Vol. 79, No. 2, 2012, 249-258.**P. Sam Johnson**and S. Balaji, “*Hyers-Ulam Stability of Linear Operators in Frechet Spaces"*, Applied Mathematics and Information Sciences, Vol. 6, No.3, 525-528 (2012).**P. Sam Johnson**and S. Balaji, “*On Linear Operators with Closed Range"*, Journal of Applied Mathematics and Bioinformatics, Vol.1, No.2, 2011, 175-182.**P. Sam Johnson**and C. Ganesa Moorthy, “*Composition of Operators with Closed Range"*, The Journal of Analysis, 14(2006), 79-80.- C. Ganesa Moorthy and
**P. Sam Johnson**, “*Composition of Closed Range Operators"*, The Journal of Analysis, 12(2004), 165-169.

- Ameya Vyas and
**P. Sam Johnson**, “*Anomaly Detection in Electric Powertrain System Software Behaviour"*, Published in: 2023 14th International Conference on Computing Communication and Networking Technologies (ICCCNT), 06-08 July 2023, Delhi (Publisher: IEEE). - Vinoth A and
**P. Sam Johnson**, “*Factorization of EP Operators in Krein Spaces"*, Mathematical Analysis and Computing, Springer Proceedings in Mathematics and Statistics, 344, pp. 359-364, 2021 (Proceedings of the International Conference on Mathematical Analysis and Computing held at SSN College of Engineering, Chennai on December 23-24, 2019). - C. Ganesa Moorthy and
**P. Sam Johnson**, “*Closed Range - Multiplication Operators"*, Mathematical Analysis and Applications, Narosa Publishing House, pp 133-138, 2004 (Proceedings of the International Conference on Analysis and Discrete Structures held at Indian Institute of Technology, Kharagpur on December 22-24, 2002).

- K. Mahesh Krishna and
**P. Sam Johnson**,*“Multipliers for Lipschitz p-Bessel Sequences in Metric Spaces”.* - Athira Satheesh K,
**P. Sam Johnson**and K. Kamaraj,*“Reverse Order Law for Moore-Penrose Inverse of Closed Operators and its Applications”.* - Rahid A and
**P. Sam Johnson**,*“On a Sub-class of Matrices Having Convex Sign-reversing Set”.* - Rahid A and
**P. Sam Johnson**,*“Sign Reversing Set of Operators on Hilbert Spaces”.* - Sachin Manjunath Naik and
**P. Sam Johnson**,*“Complementable Operators and their Schur Complements”.* - Arup Majumdar and
**P. Sam Johnson**,*“A-Approximate Point Spectrum of A-Bounded Operators in Semi-Hilbertian Spaces”.* - Arup Majumdar and
**P. Sam Johnson**,*“The Moore-Penrose inverses of unbounded closable operators and the Cartesian product of closed operators in Hilbert spaces”.* - Arup Majumdar and
**P. Sam Johnson**,*“A Formula of A-Spectral Radius for A*^{1/2}-Adjoint Operators on Semi-Hilbertian Spaces”. - Arup Majumdar,
**P. Sam Johnson**and R. N. Mohapatra,*“Hyers-Ulam Stability of Unbounded Closable Operators in Hilbert Spaces”.* - A. Karpagam, K. Kamaraj and
**P. Sam Johnson**,*“Some Characterizations of Matrix Partial Orders in Indefinite Inner Product Spaces”.*