NÕMMIK, Allan; KUKEMELK, Sven. Developing gravity model for airline regional route modelling. Aviation, [S. l.], v. 20, n. 1, p. 32–37, 2016. DOI: 10.3846/16487788.2016.1168007. Disponível em: https://journals.vilniustech.lt/index.php/Aviation/article/view/697. Acesso em: 12 may. 2025.