NN Petrov - Vestnik Udmurtskogo Universiteta. Matematika …, 2017 - mathnet.ru
NN Petrov, “One problem of group pursuit with fractional derivatives and phase constraints”,
Vestn. Udmurtsk. Univ. Mat. Mekh. Komp. Nauki, 27:1 (2017), 54–59 Vestnik Udmurtskogo …