Differential equations with maxima DD Bainov, SG Hristova Crc Press, 2011 | 119 | 2011 |

A survey of Lyapunov functions, stability and impulsive Caputo fractional differential equations R Agarwal, S Hristova, D O’Regan Fractional Calculus and Applied Analysis 19 (2), 290-318, 2016 | 82 | 2016 |

Stability of Caputo fractional differential equations by Lyapunov functions R Agarwal, D O’Regan, S Hristova Applications of Mathematics 60 (6), 653-676, 2015 | 66 | 2015 |

Monotone-iterative techniques of V. Lakshmikantham for a boundary value problem for systems of impulsive differential-difference equations SG Hristova, DD Bainov Journal of mathematical analysis and applications 197 (1), 1-13, 1996 | 66 | 1996 |

Non-Instantaneous Impulses in Differential Equations R Agarwal, S Hristova, D O’Regan | 61 | 2017 |

Stability by Lyapunov like functions of nonlinear differential equations with non-instantaneous impulses R Agarwal, D O’regan, S Hristova Journal of Applied Mathematics and Computing 53 (1-2), 147-168, 2017 | 48 | 2017 |

Periodic boundary value problems for systems of first order impulsive differential equations DD Bainov, SG Hristova, S Hu, V Lakshmikantham Differential and Integral Equations 2 (1), 37-43, 1989 | 43 | 1989 |

Lipschitz stability of differential equations with non-instantaneous impulses S Hristova, R Terzieva Advances in Difference Equations 2016 (1), 1-13, 2016 | 40* | 2016 |

Non-instantaneous impulses in Caputo fractional differential equations R Agarwal, S Hristova, D O’Regan Fractional Calculus and Applied Analysis 20 (3), 595-622, 2017 | 31 | 2017 |

Monotone iterative technique for the initial value problem for differential equations with non-instantaneous impulses R Agarwal, D O'Regan, S Hristova Applied Mathematics and Computation 298, 45-56, 2017 | 30 | 2017 |

Lyapunov functions and strict stability of Caputo fractional differential equations R Agarwal, S Hristova, D O’Regan Advances in Difference Equations 2015 (1), 1-20, 2015 | 30 | 2015 |

Stability on a cone in terms of two measures for impulsive differential equations with “supremum” SG Hristova Applied mathematics letters 23 (5), 508-511, 2010 | 29 | 2010 |

Qualitative investigations and approximate methods for impulsive equations SG Hristova Nova Science Publ., 2009 | 29 | 2009 |

Existence of periodic solutions of nonlinear systems of differential equations with impulse effect SG Hristova, DD Bainov Journal of mathematical analysis and applications 125 (1), 192-202, 1987 | 29 | 1987 |

An algorithm for approximate solving of differential equations with “maxima” A Golev, S Hristova, A Rahnev Computers & Mathematics with Applications 60 (10), 2771-2778, 2010 | 28 | 2010 |

Integral stability in terms of two measures for impulsive functional differential equations SG Hristova Mathematical and Computer Modelling 51 (1-2), 100-108, 2010 | 28 | 2010 |

Monotone-Iterative Techniques of V. Lakshmikantham for a Boundary Value Problem for Systems of Impulsive Differential Equations with" Supremum" SG Hristova, DD Bainov Journal of mathematical analysis and applications 172 (2), 339-352, 1993 | 28 | 1993 |

Practical stability with respect to initial time difference for Caputo fractional differential equations R Agarwal, D O’Regan, S Hristova, M Cicek Communications in Nonlinear Science and Numerical Simulation 42, 106-120, 2017 | 27 | 2017 |

Noninstantaneous impulses in Caputo fractional differential equations and practical stability via Lyapunov functions R Agarwal, S Hristova, D O’Regan Journal of the Franklin Institute 354 (7), 3097-3119, 2017 | 25 | 2017 |

Nonlinear delay integral inequalities for piecewise continuous functions and applications SG Hristova Journal of Inequalities in Pure and Applied Mathematics 5 (4), 1-14, 2004 | 25 | 2004 |