Andrzej Mostowski. On the Rules of Proof in the Pure Functional Calculus of the First Order. Journal of Symbolic Logic, 16(2):107-111, 1951.
@article{Mostowski51, title = {On the Rules of Proof in the Pure Functional Calculus of the First Order}, author = {Andrzej Mostowski}, year = {1951}, tags = {rule-based, rules}, researchr = {https://researchr.org/publication/Mostowski51}, cites = {0}, citedby = {0}, journal = {Journal of Symbolic Logic}, volume = {16}, number = {2}, pages = {107-111}, }