WENDEL, J. G. A Problem in Geometric Probability. Mathematica Scandinavica, Berkeley, CA, United States, v. 11, p. 109–112, 1962. DOI: 10.7146/math.scand.a-10655. Disponível em: https://journals.msp.org/mscand/article/view/2688. Acesso em: 25 jul. 2026.