TSVETKOVA, T. Two approaches to the problem of ray seismic tomography. Geofizicheskiy Zhurnal, [S. l.], v. 37, n. 1, p. 121–133, 2015. DOI: 10.24028/gzh.0203-3100.v37i1.2015.111330. Disponível em: http://journals.uran.ua/geofizicheskiy/article/view/111330. Acesso em: 17 may. 2022.