RAKISHEV B. JUSTIFICATION OF SYSTEMS OF OPEN CAST DEVELOPMENT OF USEFUL FOSSILS AND THEIR NEW CLASSIFICATION. Scientific Journal of Pedagogy and Economics, [S. l.], n. 2, p. 6–14, 2020. Disponível em: https://journals.nauka-nanrk.kz/bulletin-science/article/view/773. Acesso em: 5 дек. 2025.