by Akhmet’ev, P. M., Frolkina, O. D.
Published in Journal of mathematical sciences (New York, N.Y.) (01.08.2020)

by Bogatyi, S A, Frolkina, O D
Published in Sbornik. Mathematics (28.02.2006)

by Frolkina, O. D.
Published in Moscow University mathematics bulletin (01.12.2009)

by Frolkina, O. D.
Published in Mathematical Notes (01.07.2006)

by Akhmet'ev, P. M, Frolkina, O. D
Year of Publication 04.12.2017

by Bogatyi, S A, Frolkina, O D
Published in Sbornik. Mathematics (28.02.2006)

by Akhmet'ev, P M, Frolkina, O D
Published in arXiv.org (04.12.2017)