00491naa#a2200169#i#450# EN\INFRA-M\bibl\407 20240426133612.5 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 riorpub.com