KOLIAN, A. V. THE SPACES OF FRENE. Proceedings of the YSU A: Physical and Mathematical Sciences, Yerevan, Armenia, v. 34, n. 2 (193), p. 36–41, 2000. DOI: 10.46991/PYSUA.2000.34.2.036. Disponível em: https://journals.ysu.am/proceedings-phys-math/article/view/vol34_no2_2000_pp036-041. Acesso em: 12 jun. 2026.