A CHARACTERIZATION OF ASPLUND SPACES WITH THE HELP OF LOCAL EPSILON-SUPPORTS OF EKELAND AND LEBOURG M Fabian, NV Zhivkov DOKLADI NA BOLGARSKATA AKADEMIYA NA NAUKITE 38 (6), 671-674, 1985 | 59 | 1985 |

Well-posed constrained optimization problems in metric spaces JP Revalski, NV Zhivkov Journal of optimization theory and applications 76 (1), 145-163, 1993 | 24 | 1993 |

Metric projections and anti-projections in strictly convex normed spaces NV Zhivkov DOKLADI NA BOLGARSKATA AKADEMIYA NA NAUKITE 31 (4), 369-372, 1978 | 17 | 1978 |

Compacta with dense ambiguous loci of metric projections and antiprojections NV Zhivkov Proceedings of the American Mathematical Society 123 (11), 3403-3411, 1995 | 16 | 1995 |

Generic Gâteaux differentiability of directionally differentiable mappings NV Zhivkov Rev. Roum. Math. Pure. Appl. 32 (2), 179, 1987 | 16 | 1987 |

Compactly uniformly convex spaces and property (β) of Rolewicz SJ Dilworth, D Kutzarova, NL Randrianarivony, JP Revalski, NV Zhivkov Journal of Mathematical Analysis and Applications 402 (1), 297-307, 2013 | 10 | 2013 |

Continuity and non-multi-valuedness properties of metric projections and anti-projections NV Zhivkov Serdica Bulgaricae Mathematicae Publications 8 (4), 378, 1982 | 10 | 1982 |

A characterization of reflexive spaces by means of continuous approximate selections for metric projections NV Zhivkov Journal of approximation theory 56 (1), 59-71, 1989 | 9 | 1989 |

Best approximation problems in compactly uniformly rotund spaces JP Revalski, NV Zhivkov J. Convex Anal 19 (4), 1153-1166, 2012 | 7 | 2012 |

Formalizing the Optimization Problem in Long-Term Capability Planning T Tagarev, T Tsachev, N Zhivkov Information & Security: An International Journal 23 (1), 2009 | 7 | 2009 |

Densely two-valued metric projections in uniformly convex Banach spaces NV Zhivkov Set-Valued Analysis 3 (2), 195-209, 1995 | 7 | 1995 |

Generic Gâteaux differentiability of locally Lipschitzian functions NV Zhivkov Constructive Function Theory 81, 590-594, 1981 | 7 | 1981 |

Lenses and asymptotic midpoint uniform convexity SJ Dilworth, D Kutzarova, NL Randrianarivony, JP Revalski, NV Zhivkov Journal of Mathematical Analysis and Applications 436 (2), 810-821, 2016 | 5 | 2016 |

PLANE POLYGONAL-APPROXIMATION OF BOUNDED CONVEX-SETS NV Zhivkov DOKLADI NA BOLGARSKATA AKADEMIYA NA NAUKITE 35 (12), 1631-1634, 1982 | 4 | 1982 |

Examples of plane compacta with dense ambiguous loci NV Zhivkov Dokladi na Bulgarskata Akademia na Naukite 46 (1), 27-30, 1993 | 3 | 1993 |

Properties of typical bounded closed convex sets in Hilbert space FS De Blasi, NV Zhivkov Abstract and Applied Analysis 2005 (4), 423-436, 2005 | 2 | 2005 |

The number of nearest and farthest points to a compactum in Euclidean space FS de Blasi, NV Zhivkov Israel Journal of Mathematics 130 (1), 347-363, 2002 | 2 | 2002 |

On two-loci of metric projections FS De Blasi, NV Zhivkov Archiv der Mathematik 73 (1), 42-49, 1999 | 2 | 1999 |

Peano continua generating densely multivalued metric projections NV Zhivkov Rend. Sem. Mat. Univ. Politec. Torino 52 (4), 335-346, 1994 | 2 | 1994 |

Small sets in best approximation theory JP Revalski, NV Zhivkov Journal of Global Optimization 50 (1), 77-91, 2011 | 1 | 2011 |