SZŐNYI, T. COMBINATORIAL PROBLEMS FOR ABELIAN GROUPS ARISING FROM GEOMETRY. Periodica Polytechnica Transportation Engineering, [S. l.], v. 19, n. 1-2, p. 91–100, 1991. Disponível em: https://pp.bme.hu/tr/article/view/6688. Acesso em: 10 apr. 2025.