00603naa#a2200169#i#4500001001500000005001700015011001400032100004100046102000700087200005300094210012500147215001000272608002700282686006500309700003700374856002200411EN\\bibl\3819020240429180555.1##a2686-9896##a20200616b2020####ek#y0engy0150####ca##aRU1#aABOUT EXISTENCE MODEL COMPANIONeJournal article1#aAngarskcFederal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»d2020##a0 с.##aJournal article2local##aОбщие вопросы математики. 27.012grnti#1aChihachevgSergey Aleksandrovich4#aangtu.editorum.ru