Robert E. Clay. A simple proof of functional completeness in many-valued logics based on Łukasiewicz's C and N. Notre Dame journal of formal logic, vol. 3 (1962), pp. 114–117. - Robert E. Clay. Note on Stupecki T-functions. The journal of symbolic logic, vol. 27 no. 1 (for 1962, pub. 1963), pp. 53–54.
Arto K. Salomaa · Journal of Symbolic Logic · 1965
Robert E. Clay. A simple proof of functional completeness in many-valued logics based on Łukasiewicz's C and N. Notre Dame journal of formal logic, vol. 3 (1962), pp. 114–117. - Robert E. Clay. Note on Stupecki T-functions. The journal of symbolic logic, vol. 27 no. 1 (for 1962, pub. 1963), pp. 53–54. - Volume 30 Issue 1