BATIŠČEVAS, Henrikas. The Problem of Substance. Problemos, [S. l.], v. 6, p. 14–19, 1970. DOI: 10.15388/Problemos.1970.6.5790. Disponível em: https://test.zurnalai.vu.lt/problemos/article/view/5790. Acesso em: 26 oct. 2025.