Сидорова, Л., Кацнельсон, Е. and Балаева-Тихомирова, О. 2021. BIOCHEMICAL STUDIES ON THE NATURAL OBJECTS IN THE ORGANIZATION OF CHEMICAL EXPERIMENT AT SCHOOL. SWorldJournal. 5, 08-05 (May 2021), 77–85. DOI:https://doi.org/10.30888/2663-5712.2021-08-05-057.