00490naa#a2200169#i#450# EN\INFRA-M\bibl\407 20241226021441.4 2308-4898 20130725b2013####ek#y0engy0150####ca RUS RU About one special case related to crossing of quadrics Journal article Moscow INFRA-M Academic Publishing LLC. 2013 3 с. Journal article local Korotkiy Viktor Anatol'evich naukaru.ru