BADERTSCHER, E. Harmonic analysis and Radon transforms on pencils of geodesics. Mathematica Scandinavica, Berkeley, CA, United States, v. 58, p. 187–214, 1986. DOI: 10.7146/math.scand.a-12140. Disponível em: https://journals.msp.org/mscand/article/view/1493. Acesso em: 25 jul. 2026.