00643naa#a2200217#i#450# EN\INFRA-M\bibl\18192 /en/manage/index 20241202050034.1 2308-4898 20170928b2017####ek#y0engy0150####ca RUS RU Four-Dimensional Space’s Hypersurface Mapping Singularity Journal article Moscow INFRA-M Academic Publishing LLC. 2017 7 с. Journal article local Математика. 51 RUS Lyashkov A. A. Panchuk K. L. Varepo L. G. test.editorum.ru /en/manage/index