by Savchin, Vladimir Mikhailovich, Trinh, Phuoc Toan
Published in Izvestiâ Saratovskogo universiteta. Novaâ seriâ. Seriâ Matematika. Mehanika. Informatika (Online) (01.05.2024)

by Savchin, Vladimir, Trinh, Phuoc
Published in Luchshie medit͡s︡inskie t͡s︡entry Moskvy (01.08.2022)

by Savchin, V.M., Budochkina, S.A., Gondo, Yake, Slavko, A.V.
Published in Eurasian Mathematical Journal (2018)