Daniel Richardson. Sets of Theorems with Short Proofs. Journal of Symbolic Logic, 39(2):235-242, 1974.
@article{Richardson74, title = {Sets of Theorems with Short Proofs}, author = {Daniel Richardson}, year = {1974}, researchr = {https://researchr.org/publication/Richardson74}, cites = {0}, citedby = {0}, journal = {Journal of Symbolic Logic}, volume = {39}, number = {2}, pages = {235-242}, }