Arto Salomaa. Some analogues of Sheffet functions in infinite-valued logics. Proceedings of a Colloquium on Modal and Many-valued Logics, Helsinki, 23–26 August, 1962, Acta philosophica Fennica, no. 16, Helsinki1963, pp. 227–235.
Norman M. Martin · Journal of Symbolic Logic · 1966
Arto Salomaa. Some analogues of Sheffet functions in infinite-valued logics. Proceedings of a Colloquium on Modal and Many-valued Logics, Helsinki, 23–26 August, 1962, Acta philosophica Fennica, no. 16, Helsinki1963, pp. 227–235. - Volume 31 Issue 1