Mykhailo Pylypovych Kravchuk (27.09.1892–09.03.1942), famous ukrainian mathematician (on the 125th anniversary of his birth) - Yu. M. Berezanskyi; V. S. Koroliuk; I. O. Lukovskyi; V. L. Makarov; M. O. Perestiuk; A. M. Samoilenko; Yu. Yu. Trokhymchuk; Yu. A. Drozd; Yu. S. Samoilenko; N. O. Virchenko (Ukrainian Mathematical Journal, 2017)