HANANI, Haim. A Note on Steiner Triple Systems. Mathematica Scandinavica, Berkeley, CA, United States, v. 8, p. 154–156, 1960. DOI: 10.7146/math.scand.a-10603. Disponível em: https://journals.msp.org/mscand/article/view/2742. Acesso em: 25 jul. 2026.