—, —. Reminiscence of a friend. On the death of Ivan Pavlovych Isak. Ukrainian Neurosurgical Journal, [S. l.], n. 1, p. 63–64, 2017. DOI: 10.25305/unj.96119. Disponível em: https://theunj.org/article/view/96119. Acesso em: 30 may. 2024.