FOATA, D.; SCHÜTZENBERGER, M. P. On the Principle of Equivalence of Sparre Andersen. MATHEMATICA SCANDINAVICA, [S. l.], v. 28, p. 308–316, 1971. DOI: 10.7146/math.scand.a-11025. Disponível em: https://tidsskrift.dk/math/article/view/11025. Acesso em: 14 aug. 2026.