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Lobachevskii Journal of Mathematics > 2018 > 39 > 9 > 1300-1304
Lobachevskii Journal of Mathematics > 2014 > 35 > 2 > 51-55
Reports on Mathematical Physics > 2002 > 49 > 1 > 113-122
Reports on Mathematical Physics > 2001 > 47 > 3 > 431-462