MANASYAN, M.G. MAIN ISSUES OF GEOGRAPHICAL RESEARCHES OF SERVICE. Proceedings of the YSU C: Geological and Geographical Sciences, Yerevan, Armenia, v. 47, n. 1 (230), p. 36–42, 2013. DOI: 10.46991/PYSU:C/2013.47.1.036. Disponível em: https://journals.ysu.am/index.php/proceedings-geol-geogr/article/view/vol47_no1_2013_pp036-042. Acesso em: 20 may. 2024.