TOCK, T. Construction and the use of matrices of proximity in commercial centres. JORBEL - Belgian Journal of Operations Research, Statistics, and Computer Science, [S. l.], v. 20, n. 4, p. 2–15, 1980. Disponível em: https://orbel.be/jorbel/index.php/jorbel/article/view/508. Acesso em: 28 mar. 2024.