SHOYKHET, B.; PETROSJAN, L. The set theoretical approach to the problems of pursuit. Lithuanian Mathematical Journal, [S. l.], v. 8, n. 2, p. 371–380, 1968. DOI: 10.15388/LMJ.1968.20223. Disponível em: https://www.zurnalai.vu.lt/LMJ/article/view/20223. Acesso em: 8 jun. 2025.