doi.org/10.1007/3-540-10003-2_61
European Conference on Numerical Mathematics and Advanced Applications

Bergstra, J.& Tucker, J. (1980). A characterisation of computable data types by means of a finite equational specification method. Lecture Notes in Computer Science/Lecture Notes in Artificial Intelligence, 76–90.https://doi.org/10.1007/3-540-10003-2_61