Gabriel Sandu, Tapani Hyttinen. IF logic and the foundations of mathematics. Synthese, 126(1-2):37-47, 2001. [doi]
@article{SanduH01-0, title = {IF logic and the foundations of mathematics}, author = {Gabriel Sandu and Tapani Hyttinen}, year = {2001}, doi = {10.1023/A:1005231507310}, url = {http://dx.doi.org/10.1023/A:1005231507310}, researchr = {https://researchr.org/publication/SanduH01-0}, cites = {0}, citedby = {0}, journal = {Synthese}, volume = {126}, number = {1-2}, pages = {37-47}, }