00576naa#a2200181#i#450# EN\INFRA-M\bibl\1055 20251227100256.6 2308-4898 20131203b2013####ek#y0engy0150####ca RUS RU Constructing method related to technical drawing of sphere surface with overlay of sphere’s own and falling shadows Journal article Moscow INFRA-M Academic Publishing LLC. 2013 2 с. Journal article local Nikiforov V. Maltseva Ekaterina naukaru.ru