TSAKIRIS, Manolis C.; XU, Sihang. The Fermat-Torricelli problem in the projective plane. Mathematica Scandinavica, Berkeley, CA, United States, v. 128, n. 3, 2022. DOI: 10.7146/math.scand.a-133419. Disponível em: https://journals.msp.org/mscand/article/view/100. Acesso em: 24 jul. 2026.