Differential equations with maxima DD Bainov, SG Hristova Chapman and Hall/CRC, 2011 | 107 | 2011 |

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 | 65 | 1996 |

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 | 55 | 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 | 51 | 2015 |

Periodic boundary value problems for systems of first order impulsive differential equations DD Baĭnov, SG Hristova, SC Hu, V Lakshmikantham Differential and Integral Equations 2 (1), 37-43, 1989 | 40 | 1989 |

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 | 34 | 2017 |

STABILITY OF SOLUTIONS TO IMPULSIVE CAPUTO FRACTIONAL DIFFERENTIAL EQUATIONS. R Agarwal, S Hristova, D O'REGAN Electronic Journal of Differential Equations 2016, 2016 | 31* | 2016 |

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 | 28 | 1987 |

Non-Instantaneous Impulses in Differential Equations R Agarwal, S Hristova, D O’Regan | 26 | 2017 |

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 | 26 | 1993 |

Lyapunov functions and strict stability of Caputo fractional differential equations R Agarwal, S Hristova, D O’Regan Advances in Difference Equations 2015 (1), 346, 2015 | 25 | 2015 |

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 | 25 | 2010 |

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 | 23 | 2010 |

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 | 22 | 2017 |

Integral stability in terms of two measures for impulsive functional differential equations SG Hristova Mathematical and Computer Modelling 51 (1-2), 100-108, 2010 | 22 | 2010 |

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 | 22 | 2004 |

Application of the monotone-iterative techniques of V. Lakshmikantham for solving the initial value problem for impulsive differential-difference equations SG Hristova, DD Bainov JOURNAL OF MATHEMATICS 23 (2), 1993 | 22 | 1993 |

Strict stability in terms of two measures for impulsive differential equations with ‘supremum’ RP Agarwal, S Hristova Applicable Analysis 91 (7), 1379-1392, 2012 | 20 | 2012 |

Qualitative investigations and approximate methods for impulsive equations SG Hristova Nova Science Publ., 2009 | 20 | 2009 |

Monotone-iterative techniques of Lakshmikantham for a boundary value problem for systems of differential equations with maxima DD Bainov, SG Hristova Journal of mathematical analysis and applications 190 (2), 391-401, 1995 | 20 | 1995 |