Yessenbayeva, G.A., and D.N. Yesbayeva. “Characterizations for the Family of Functions Classes {B^r_p,q,N} and Their Connection With Besov’s Spaces”. Bulletin of the Karaganda University. Mathematics Series, vol. 87, no. 3, Sept. 2017, pp. 70-75, doi:10.31489/2017m3/70-75.