Research Article
Rong Ju, Natalya V. Buldakova, Svetlana N. Sorokoumova, Marina G. Sergeeva, Alexander A. Galushkin, Andrey A. Soloviev, Nina I. Kryukova
EURASIA J Math Sci Tech Ed, Volume 13, Issue 8, pp. 5281-5293
https://doi.org/10.12973/eurasia.2017.01003a