00613naa#a2200169#i#450# EN\\bibl\18962 20240903191219.2 2312-4431 20171228b2017####ek#y0engy0150####ca RUS RU PROFESSIONAL ADVANCEMENT OF TEACHERS IN THE CONTEXT OF EDUCATIONAL ACTIVITY: CONCEPTUAL AND MANAGERIAL ASPECTS Journal article Cheboksary Non-state educational private institution of additional professional education "Expert-methodological centre" 2017 6 с. Journal article local Legostaev Bogdan L. naukaru.ru