VARDANYAN, R.R.; SUVARYAN, S.R. INNOVATIONS IN SERVICE. Proceedings of the YSU C: Geological and Geographical Sciences, Yerevan, Armenia, v. 51, n. 1 (242), p. 50–54, 2017. DOI: 10.46991/PYSU:C/2017.51.1․050. Disponível em: https://journals.ysu.am/index.php/proceedings-geol-geogr/article/view/vol51_no1_2017_pp050-054. Acesso em: 22 jul. 2024.