On positive definiteness of some functions VP Zastavnyi Journal of Multivariate Analysis 73 (1), 55-81, 2000 | 87 | 2000 |

Positive definite functions depending on the norm VP Zastavnyi Russian Journal of Mathematical Physics 1, 511-522, 1993 | 42 | 1993 |

Characterization theorems for some classes of covariance functions associated to vector valued random fields E Porcu, V Zastavnyi Journal of Multivariate Analysis 102 (9), 1293-1301, 2011 | 38 | 2011 |

Characterization theorems for the Gneiting class of space–time covariances VP Zastavnyi, E Porcu Bernoulli 17 (1), 456-465, 2011 | 27 | 2011 |

Positive-definite splines of special form VP Zastavnyi, RM Trigub Sbornik: Mathematics 193 (12), 1771, 2002 | 22 | 2002 |

On some properties of Buhmann functions. V Zastavnyi Ukrainian Mathematical Journal 58 (8), 2006 | 20 | 2006 |

Radial positive definite functions and spectral theory of the Schrödinger operators with point interactions N Goloshchapova, M Malamud, V Zastavnyi Mathematische Nachrichten 285 (14‐15), 1839-1859, 2012 | 14 | 2012 |

Buhmann covariance functions, their compact supports, and their smoothness E Porcu, P Zastavyi, M Bevilacqua arXiv preprint arXiv:1606.09527, 2016 | 12 | 2016 |

Exact estimation of an approximation of some classes of differentiable functions by convolution operators VP Zastavnyi Journal of Mathematical Sciences 175 (2), 192-210, 2011 | 11 | 2011 |

Positive definite functions and spectral properties of the Schrödinger operator with point interactions NI Goloshchapova, VP Zastavnyi, MM Malamud Mathematical notes 90 (1), 149-154, 2011 | 10 | 2011 |

Positive definite radial functions and splines VP Zastavnyi Doklady. Mathematics 66 (2), 213-216, 2002 | 10 | 2002 |

Positive definite norm dependent functions WP Zastawny Dokl. Russian Acad. Nauk 325, 901-903, 1992 | 10 | 1992 |

Generalized Askey functions and their walks through dimensions E Porcu, V Zastavnyi Expositiones Mathematicae 32 (2), 190-198, 2014 | 9 | 2014 |

Problems related to positive definite functions VP Zastavnyi Positive Definite Functions: From Schoenberg to Space–Time Challenges, 2008 | 9 | 2008 |

Concerning a set of zeroes for Fourier transform of a measure and summability of double Fourier series by Bernstein-Rogosinski type methods, Ukrain VP Zastavnyi M. Zh 36, 615-621, 1984 | 9 | 1984 |

Positive definiteness of piecewise-linear function A Manov, V Zastavnyi Expositiones Mathematicae 35 (3), 357-361, 2017 | 7 | 2017 |

On positive definiteness of some radial functions VP Zastavnyi, E Porcu Lobachevskii Journal of Mathematics 38 (2), 386-394, 2017 | 7 | 2017 |

Positive-definite functions that depend on a norm VP Zastavnyi Doklady Akademii Nauk 325 (5), 901-903, 1992 | 7 | 1992 |

A theorem on zeros of entire functions and its applications VP Zastavnyi Methods of Functional Analysis and Topology 10 (02), 91-104, 2004 | 6 | 2004 |

Extension of a Function from the Exterior of an Interval to a Positive-Definite Function on the Entire Axis and an Approximation Characteristic of the Class W_M^{r,\beta}. VP Zastavnyi Ukrainian Mathematical Journal 55 (7), 2003 | 6 | 2003 |