Dick De Jongh, Albert Visser. Explicit Fixed Points in Interpretability Logic. Studia Logica, 50(1):39-49, 1991. [doi]
@article{JonghV91, title = {Explicit Fixed Points in Interpretability Logic}, author = {Dick De Jongh and Albert Visser}, year = {1991}, doi = {10.1007/BF00370386}, url = {http://dx.doi.org/10.1007/BF00370386}, researchr = {https://researchr.org/publication/JonghV91}, cites = {0}, citedby = {0}, journal = {Studia Logica}, volume = {50}, number = {1}, pages = {39-49}, }