Theory of Probability and Mathematical Statistics (Theory Probab. Math. Statist.) (20210101), No.~104, 23-47. ISSN: 0094-9000 (print).eISSN: 1547-7363.
Theory of Probability and Mathematical Statistics (Theory Probab. Math. Statist. ) (2019), No.~98, 142--162 ISSN: 15477363, 00949000. eISSN: 1547-7363.