Best quadrature formulas on sets of functionsLevin, Meiše; Giršovitš, Juri; Arro, VoldemarSoviet mathematics doklady : translation of all the pure mathematics sections of doklady Akademii Nauk SSSR1976 / p. 46-50

Extremal problems for cubature formulasLevin, Meiše; Giršovitš, JuriSoviet mathematics doklady : translation of all the pure mathematics sections of doklady Akademii Nauk SSSR1977 / p. 1355-1358