ILMAVIRTA, J.; RAILO, J. Geodesic ray transform with matrix weights for piecewise constant functions. Annales Fennici Mathematici, [S. l.], v. 45, n. 2, p. 1095–1102, 2020. DOI: 10.5186/aasfm.2020.4558. Disponível em: https://afm.journal.fi/article/view/135900. Acesso em: 20 maj. 2024.