A numerical method for boundary value problems for singularly perturbed fourth-order ordinary differential equations V Shanthi, N Ramanujam Applied Mathematics and Computation 129 (2-3), 269-294, 2002 | 47 | 2002 |

A numerical algorithm for singular perturbation problems exhibiting weak boundary layers S Natesan, J Vigo-Aguiar, N Ramanujam Computers & mathematics with applications 45 (1-3), 469-479, 2003 | 45 | 2003 |

A computational method for solving boundary value problems for third-order singularly perturbed ordinary differential equations S Valarmathi, N Ramanujam Applied Mathematics and Computation 129 (2-3), 345-373, 2002 | 45 | 2002 |

An asymptotic initial value method for boundary value problems for a system of singularly perturbed second order ordinary differential equations T Valanarasu, N Ramanujam Applied Mathematics and Computation 147 (1), 227-240, 2004 | 43 | 2004 |

A computational method for solving singularly perturbed turning point problems exhibiting twin boundary layers S Natesan, N Ramanujam Applied Mathematics and computation 93 (2-3), 259-275, 1998 | 43 | 1998 |

A numerical method for singularly perturbed weakly coupled system of two second order ordinary differential equations with discontinuous source term A Tamilselvan, N Ramanujam, V Shanthi Journal of computational and Applied Mathematics 202 (2), 203-216, 2007 | 41 | 2007 |

A computational method for solving singular perturbation problems J Jayakumar, N Ramanujam Applied Mathematics and Computation 55 (1), 31-48, 1993 | 32 | 1993 |

A numerical method for singular perturbation problems arising in chemical reactor theory J Jayakumar, N Ramanujam Computers & Mathematics with Applications 27 (5), 83-99, 1994 | 31 | 1994 |

A boundary value technique for boundary value problems for singularly perturbed fourth-order ordinary differential equations V Shanthi, N Ramanujam Computers & Mathematics with Applications 47 (10-11), 1673-1688, 2004 | 30 | 2004 |

An asymptotic numerical method for singularly perturbed third-order ordinary differential equations of convection-diffusion type S Valarmathi, N Ramanujam Computers & Mathematics with Applications 44 (5-6), 693-710, 2002 | 30 | 2002 |

An Initial Value Technique for Singularly Perturbed Convection-Diffusion Problems with a Negative Shift N Ramanujam JOURNAL OF OPTIMIZATION THEORY AND APPLICATIONS 158 (1), 234-250, 2013 | 29 | 2013 |

Fitted mesh method for singularly perturbed reaction-convection-diffusion problems with boundary and interior layers V Shanthi, N Ramanujam, S Natesan Journal of Applied Mathematics and Computing 22 (1-2), 49-65, 2006 | 27 | 2006 |

Initial-value technique for singularly perturbed boundary-value problems for second-order ordinary differential equations arising in chemical reactor theory S Natesan, N Ramanujam Journal of optimization theory and applications 97 (2), 455-470, 1998 | 26 | 1998 |

A “Booster method” for singular perturbation problems arising in chemical reactor theory S Natesan, N Ramanujam Applied mathematics and computation 100 (1), 27-48, 1999 | 25 | 1999 |

Asymptotic Initial Value Technique for singularly perturbed convection-diffusion delay problems with boundary and weak interior layers N Ramanujam APPLIED MATHEMATICS LETTERS 25 (12), 2272-2278, 2012 | 23 | 2012 |

Improvement of numerical solution of selfadjoint singular perturbation problems by incorporation of asymptotic approximations S Natesan, N Ramanujam Applied mathematics and computation 98 (2-3), 119-137, 1999 | 22 | 1999 |

Asymptotic numerical methods for singularly perturbed fourth order ordinary differential equations of convection–diffusion type V Shanthi, N Ramanujam Applied mathematics and computation 133 (2-3), 559-579, 2002 | 21 | 2002 |

Singular perturbation problems for systems of partial differential equations of elliptic type N Ramanujam, UN Srivastava Journal of Mathematical Analysis and Applications 71 (1), 18-35, 1979 | 21 | 1979 |

Asymptotic numerical method for boundary value problems for singularly perturbed fourth-order ordinary differential equations with a weak interior layer V Shanthi, N Ramanujam Applied mathematics and computation 172 (1), 252-266, 2006 | 20 | 2006 |

“Shooting method” for the solution of singularly perturbed two-point boundary-value problems having less severe boundary layer S Natesan, N Ramanujam Applied mathematics and computation 133 (2-3), 623-641, 2002 | 20 | 2002 |