Research Article
Mikhail N. Mikhaylovsky, Lyudmila Zh. Karavanova, Eleonora I. Medved, Nelia А. Deberdeeva, Lyudmila M. Buzinova, Andrey A. Zaychenko
EURASIA J Math Sci Tech Ed, Volume 17, Issue 9, Article No: em2007
https://doi.org/10.29333/ejmste/11173