A robust adaptive method for a quasi-linear one-dimensional convection-diffusion problem N Kopteva, M Stynes SIAM Journal on Numerical Analysis 39 (4), 1446-1467, 2001 | 170 | 2001 |

Error analysis of the L1 method on graded and uniform meshes for a fractional-derivative problem in two and three dimensions N Kopteva Mathematics of Computation 88 (319), 2135-2155, 2019 | 117 | 2019 |

Shishkin meshes in the numerical solution of singularly perturbed differential equations N Kopteva, E O'Riordan Institute for Scientific Computing and Informaton, 2010 | 117 | 2010 |

Maximum norm a posteriori error estimates for a one-dimensional convection-diffusion problem N Kopteva SIAM Journal on numerical analysis 39 (2), 423-441, 2001 | 94 | 2001 |

Maximum norm a posteriori error estimates for a 1D singularly perturbed semilinear reaction–diffusion problem N Kopteva IMA journal of numerical analysis 27 (3), 576-592, 2007 | 73 | 2007 |

A singularly perturbed semilinear reaction–diffusion problem in a polygonal domain RB Kellogg, N Kopteva Journal of Differential Equations 248 (1), 184-208, 2010 | 65 | 2010 |

The formation of river channels AC Fowler, N Kopteva, C Oakley SIAM Journal on Applied Mathematics 67 (4), 1016-1040, 2007 | 59 | 2007 |

Numerical analysis of a singularly perturbed nonlinear reaction–diffusion problem with multiple solutions N Kopteva, M Stynes Applied numerical mathematics 51 (2-3), 273-288, 2004 | 59* | 2004 |

On the convergence, uniform with respect to a small parameter, of monotone three-point finite-difference approximations VB Andreev, NV Kopteva Differential Equations 34 (7), 921-929, 1998 | 51 | 1998 |

Steady rimming flows with surface tension ES Benilov, MS Benilov, N Kopteva Journal of Fluid mechanics 597, 91-118, 2008 | 50 | 2008 |

Grid equidistribution for reaction–diffusion problems in one dimension N Kopteva, N Madden, M Stynes Numerical Algorithms 40 (3), 305-322, 2005 | 50 | 2005 |

Approximation of derivatives in a convection–diffusion two-point boundary value problem N Kopteva, M Stynes Applied numerical mathematics 39 (1), 47-60, 2001 | 50 | 2001 |

A study of difference schemes with the first derviative approximated by a central difference ratio VB Andreyev, NV Kopteva Computational mathematics and mathematical physics 36 (8), 1065-1078, 1996 | 50* | 1996 |

An efficient collocation method for a Caputo two-point boundary value problem N Kopteva, M Stynes BIT Numerical Mathematics 55 (4), 1105-1123, 2015 | 45 | 2015 |

Maximum norm error analysis of a 2d singularly perturbed semilinear reaction-diffusion problem N Kopteva Mathematics of Computation 76 (258), 631-646, 2007 | 41 | 2007 |

Analysis and numerical solution of a Riemann-Liouville fractional derivative two-point boundary value problem N Kopteva, M Stynes Advances in Computational Mathematics 43 (1), 77-99, 2017 | 39 | 2017 |

Maximum-norm a posteriori error estimates for singularly perturbed elliptic reaction-diffusion problems A Demlow, N Kopteva Numerische Mathematik 133, 707-742, 2016 | 36 | 2016 |

A robust grid equidistribution method for a one-dimensional singularly perturbed semilinear reaction–diffusion problem NM Chadha, N Kopteva IMA journal of numerical analysis 31 (1), 188-211, 2011 | 36 | 2011 |

Uniform convergence with respect to a small parameter of a scheme with central difference on refining grids NV Kopteva Computational mathematics and mathematical physics 39 (10), 1594-1610, 1999 | 36* | 1999 |

Maximum norm a posteriori error estimation for parabolic problems using elliptic reconstructions N Kopteva, T Linss SIAM Journal on Numerical Analysis 51 (3), 1494-1524, 2013 | 34* | 2013 |