Approximation of approximation numbers by truncation A Böttcher, AV Chithra, MNN Namboodiri Integral Equations and Operator Theory 39 (4), 387-395, 2001 | 23 | 2001 |

Korovkin-type approximation on C∗-algebras BV Limaye, MNN Namboodiri Journal of Approximation Theory 34 (3), 237-246, 1982 | 14 | 1982 |

A generalized noncommutative Korovkin theorem and -closedness of certain sets of convergence BV Limaye, MNN Namboodiri Illinois Journal of Mathematics 28 (2), 267-280, 1984 | 12 | 1984 |

DEVELOPMENTS IN NONCOMMUTATIVE KOROVKIN-TYPE THEOREMS (Noncommutative Structure in Operator Theory and its Application) MNN Namboodiri 京都大学数理解析研究所, 2011 | 9 | 2011 |

Perturbation of operators and approximation of spectrum K Kumar, MNN Namboodiri, S Serra-Capizzano Proceedings-Mathematical Sciences 124 (2), 205-224, 2014 | 8 | 2014 |

A Note on a Discrete Version of Borg's Theorem via Toeplitz-Laurent Operators with Matrix-Valued Symbols L Golinskii, K Kumar, MNN Namboodiri, S Serra-Capizzano Bollettino dell'Unione Matematica Italiana 6 (1), 205-218, 2013 | 7 | 2013 |

Truncation method for operators with disconnected essential spectrum MNN Namboodiri Proceedings of the Indian Academy of Sciences-Mathematical Sciences 112 (1 …, 2002 | 7 | 2002 |

Weak Korovkin approximation by completely positive linear maps on β (H) BV Limaye, MNN Namboodiri Journal of approximation theory 42 (3), 201-211, 1984 | 7 | 1984 |

Preconditioners and Korovkin-type theorems for infinite-dimensional bounded linear operators via completely positive maps K Kumar, MNN Namboodiri, S Serra-Capizzano Studia Math 218 (2), 95-118, 2013 | 6 | 2013 |

Theory of spectral gaps-a short survey MNN Namboodiri J. Anal 12 (1-8), 603, 2005 | 6 | 2005 |

Quasi hyperrigidity and weak peak points for non-commutative operator systems MNN Namboodiri, S Pramod, P Shankar, AK Vijayarajan Proceedings-Mathematical Sciences 128 (5), 66, 2018 | 4 | 2018 |

Weak approximation by positive maps on -algebras BV Limaye, MNN Namboodiri Mathematica Slovaca 36 (1), 91-99, 1986 | 4 | 1986 |

Geometric theory of weak Korovkin sets MNN Namboodiri Oper. Matrices 6, 271-278, 2012 | 3 | 2012 |

An elementary proof for a characterization of*-isomorphisms S Kulkarni, M Nair, M Namboodiri Proceedings of the American Mathematical Society 134 (1), 229-234, 2006 | 3 | 2006 |

Approximation by positive functionals BV Limaye, MNN Namboodiri J. Indian Math. Soc 43 (1979), 195-202, 1979 | 3 | 1979 |

Finite dimensional Cebysev subspaces of C*-algebras MNN Namboodiri, S Pramod, AK Vijayarajan JOURNAL OF THE RAMANUJAN MATHEMATICAL SOCIETY 29 (1), 63-74, 2014 | 2 | 2014 |

A Korovkin-type theory for non-self-adjoint Toeplitz operators VBK Kumar, MNN Namboodiri, R Rajan Linear Algebra and its Applications 543, 140-161, 2018 | 1 | 2018 |

A note on Szego's theorem MNN Namboodiri, S Remadevi Journal of Computational Analysis and Applications 6 (2), 147-152, 2004 | 1 | 2004 |

Discrete Spectrum of Non-selfadjoint Schrödinger Operators and An Application to Ocean Acoustics S Satheesh Kumar, MNN Namboodiri Cochin University of Science and Technology, 2018 | | 2018 |

On continuous movement of the discrete spectrum of Schr\" odinger operators MNN Namboodiri, SS Kumar arXiv preprint arXiv:1804.09560, 2018 | | 2018 |