00529naa#a2200181#i#4500001002200000005001700022011001400039100004100053101000800094102000700102200008000109210005100189215001100240608002700251675003400278700001900312856001600331EN\INFRA-M\bibl\2804520240920061332.5##a2308-4898##a20190408b2019####ek#y0engy0150####ca0#aRUS##aRU1#aGeneral Principles for Formation of Ruled Surfaces. Part 2eJournal article1#aMoscowcINFRA-M Academic Publishing LLC.d2019##a13 с.##aJournal article2local##aМатематика. 51zRUS#1aSal'kovgN. A.4#ariorpub.com