00525naa#a2200157#i#450# EN\\bibl\16859 20240728202714.7 2312-4431 20170609b2017####ek#y0engy0150####ca RU Problems solving. Stages and methods Journal article Cheboksary Non-state educational private institution of additional professional education "Expert-methodological centre" 2017 5 с. Journal article local Krynina Ol'ga Viktorovna naukaru.ru