KREYKENBOHM, I.; FÜRST, F.; BARRÁGAN, L.; WILMS, J.; ROTHSCHILD, R. E.; SUCHY, S.; POTTSCHMIDT, K. 4U 1909+07: a Hidden Pearl. Acta Polytechnica, [S. l.], v. 51, n. 1, 2011. DOI: 10.14311/1326. Disponível em: https://ojst.is.cvut.cz/ojs/index.php/ap/article/view/1326.. Acesso em: 13 may. 2025.