BOBOMURODOV SIROJIDDIN MENGZIYO UGLI. PRINCIPLES OF SELECTING MATERIALS FOR THE FORMATION OF FIRST INVARIANT AND VARIABLE CONCEPTS ABOUT NATURE IN PRIMARY CLASS STUDENTS. European International Journal of Multidisciplinary Research and Management Studies, [S. l.], v. 3, n. 01, p. 84–91, 2023. DOI: 10.55640/eijmrms-03-01-14. Disponível em: https://eipublication.com/index.php/eijmrms/article/view/599. Acesso em: 8 nov. 2024.