Ulrich Kohlenbach. Things That Can and Things That Cannot Be Done in PRA. Annals of Pure and Applied Logic, 102(3):223-245, 2000.
@article{Kohlenbach00:0, title = {Things That Can and Things That Cannot Be Done in PRA}, author = {Ulrich Kohlenbach}, year = {2000}, researchr = {https://researchr.org/publication/Kohlenbach00%3A0}, cites = {0}, citedby = {0}, journal = {Annals of Pure and Applied Logic}, volume = {102}, number = {3}, pages = {223-245}, }