00635naa#a2200193#i#450# EN\INFRA-M\bibl\13164 /en/manage/index 20241126054458.2 2308-4898 20160919b2016####ek#y0engy0150####ca RUS RU The Duality Principle Is the Theoretical Basis of Interrelation of Synthetic and Analytical Methods of Solving Geometric Problems Journal article Moscow INFRA-M Academic Publishing LLC. 2016 7 с. Journal article local Ivanov G. Dmitrieva I. M. test.editorum.ru /en/manage/index