00543naa#a2200181#i#450# EN\INFRA-M\bibl\6285 20241201154847.7 1998-1740 20150617b2015####ek#y0engy0150####ca RUS RU Mathematics Tournament as a Method to Demonstrate and to Enhance Learning Outcomes Journal article Moscow INFRA-M Academic Publishing LLC. 2015 10 с. Journal article local Chiganov Andrey Krokhmal Svetlana zh-szf.ru