BARZDAITIS, Juozas. A Historical Excursus on the Understanding of the Concept of Matter. Problemos, [S. l.], v. 4, p. 47–54, 1969. DOI: 10.15388/Problemos.1969.4.5760. Disponível em: https://www.journals.vu.lt/problemos/article/view/5760.. Acesso em: 17 aug. 2024.