00611naa#a2200169#i#4500001001500000005001700015011001400032100004100046102000700087200009800094210007000192215001000262608002700272686008900299700003100388856002200419EN\\bibl\1604820240429131752.1##a1993-7768##a20170620b2017####ek#y0engy0150####ca##aRU1#aSTUDY OF IRRATIONAL SYSTEMS BY EXTENDING  THE LOGICAL-MATHEMATICAL APPARATUSeJournal article1#aCHERKIZOVOcRussian State University of Tourism and Serviced2017##a8 с.##aJournal article2local##aТуристско-экскурсионное обслуживание. 71.372grnti#1aKortunovgVadim Vadimovich4#arguts.editorum.ru