RAMAZANOV, Vagif; CAFAROVA, Gunay; HAJIYEVA, Hafiza. Optimization of Marketing Functions in the Exchange Sphere: Main Directions, Practices and Prospects. Porta Universorum, [S. l.], v. 2, n. 2, p. 42–48, 2026. DOI: 10.69760/portuni.26020006. Disponível em: https://egarp.lt/index.php/JPURM/article/view/502.. Acesso em: 2 may. 2026.