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Lobachevskii Journal of Mathematics > 2019 > 40 > 2 > 219-229
Results in Mathematics > 2013 > 63 > 3-4 > 1289-1310
Computers and Mathematics with Applications > 2012 > 64 > 10 > 3456-3467
Lobachevskii Journal of Mathematics > 2019 > 40 > 2 > 219-229
Results in Mathematics > 2013 > 63 > 3-4 > 1289-1310
Computers and Mathematics with Applications > 2012 > 64 > 10 > 3456-3467