GOTLERAS, M. Some problems finding the volume of polyhedrons. Psichologija, [S. l.], v. 3, p. 55–59, 1962. DOI: 10.15388/Psichol.1962.3.8861. Disponível em: https://test.zurnalai.vu.lt/psichologija/article/view/8861. Acesso em: 27 oct. 2025.