00693naa#a2200205#i#4500001002200000003001700022005001700039011001400056100004100070101000800111102000700119200008200126210005100208215001000259608002700269675011300296700002000409700001900429856003900448EN\INFRA-M\bibl\20675/en/manage/index20250503055259.6##a1998-1740##a20180424b2018####ek#y0engy0150####ca0#aRUS##aRU1#aFormation of Mathematical Concepts by Younger SchoolchildreneJournal article1#aMoscowcINFRA-M Academic Publishing LLC.d2018##a4 с.##aJournal article2local##aОбразование. Воспитание. Обучение. Организация досуга. 37zRUS#1aChirkovagN. I.#1aPavlovagO. A.4#atest.editorum.ruu/en/manage/index