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О молекулярных соединениях щавелевой кислоты с некоторыми феноламиAarna, Agu; Mölder, LeeviСборник статей по химии и химической технологии. 81962 / с. 3-13 https://www.ester.ee/record=b2181584*est https://digikogu.taltech.ee/et/Item/6ec4da4c-96e0-445e-b789-9dde4bb0db38