Composition operators in Orlicz spaces Y Cui, H Hudzik, R Kumar, L Maligranda Journal of the Australian Mathematical Society 76 (2), 189-206, 2004 | 90 | 2004 |

Composition operators on Orlicz spaces R Kumar Integral equations and operator theory 29, 17-22, 1997 | 54 | 1997 |

Matrix multiplication operators on Banach function spaces. H Hudzik, R Kumar, R Kumar Proc. Indian Acad. Sci. Math. Sci. 116 (1), 71–81., 2006 | 37 | 2006 |

Topological Bicomplex Modules R Kumar, H Saini Advances in Applied Clifford Algebras, 2016 | 35 | 2016 |

Bicomplex Weighted Hardy Spaces and Bicomplex C*-algebras R Kumar, K Singh, H Saini, S Kumar Adv. Appl. Clifford Algebras 26, 217–235, 2016 | 31 | 2016 |

Weighted composition operators on Hardy and Bergman spaces R Kumar, JR Partington Recent advances in operator theory, operator algebras, and their …, 2004 | 27 | 2004 |

Boundedness, compactness and Schatten-class membership of weighted composition operators EA Gallardo-Gutiérrez, R Kumar, JR Partington Integral Equations and Operator Theory 67, 467-479., 2010 | 23 | 2010 |

Compact composition operators on Lorentz spaces R Kumar, R Kumar Mat. Vesnik 57 (3-4), 109–112., 2005 | 23 | 2005 |

Composition operators on Banach function spaces R Kumar, R Kumar Proceedings of the American Mathematical Society 133 (7), 2109-2118, 2005 | 23 | 2005 |

Bicomplex Linear Operators on Bicomplex Hilbert Spaces and Littlewood’s Subordination Theorem R Kumar, K Singh Adv. Appl. Clifford Algebras 25, 591–610, 2015 | 20 | 2015 |

The fundamental theorems in the framework of bicomplex topological modules R Kumar, R Kumar, D Rochon arXiv preprint arXiv:1109.3424, 2011 | 15 | 2011 |

Composition operators on Orlicz–Lorentz spaces R Kumar, R Kumar Integral Equations and Operator Theory 60, 79-88, 2008 | 14 | 2008 |

The fundamental theorems in the framework of bicomplex topological modules,(2011) R Kumar, R Kumar, D Rochon arXiv preprint arXiv:1109.3424 1, 0 | 11 | |

Hyperbolic valued measures and Fundamental law of probability R Kumar, K Sharma Global Journal of Pure and Applied Mathematics 13 (10), 7163-7177, 2017 | 9 | 2017 |

Some fundamental theorems of functional analysis with bicomplex and hyperbolic scalars H Saini, A Sharma, R Kumar Advances in Applied Clifford Algebras 30, 1-23, 2020 | 7 | 2020 |

Inner functions and substitution operators R Kumar, SD and Sharma Acta Sci. Math (Szeged) 58, 509-516, 1993 | 5 | 1993 |

Compactness and essential norms of composition operators on Orlicz–Lorentz spaces Y Cui, H Hudzik, R Kumar, R Kumar Applied Mathematics Letters 25 (11), 1778-1783, 2012 | 4 | 2012 |

Essential norm of weighted composition operators on the Dirichlet space. R Kumar, KJ Singh Extracta mathematicae 21 (3), 249-259, 2006 | 4 | 2006 |

2-normed D-modules and Hahn-Banach theorem for D-linear 2-functionals K Singh, R Kumar Anal. Univ. Oradea Fasc. Math. 23, 117 - 126, 2015 | 3 | 2015 |

Erratum and addendum to the paper" Compactness and essential norms of composition operators on Orlicz-Lorentz spaces"[Applied Mathematics Letters 25 (2012) 1778--1783] Y Cui, H Hudzik, R Kumar, R Kumar Commentationes Mathematicae 54 (2), 2014 | 2 | 2014 |