John Jones. Implication and Iterated Implication. Math. Log. Q., 29(10):543-556, 1983. [doi]
@article{Jones83a-0, title = {Implication and Iterated Implication}, author = {John Jones}, year = {1983}, doi = {10.1002/malq.19830291006}, url = {http://dx.doi.org/10.1002/malq.19830291006}, researchr = {https://researchr.org/publication/Jones83a-0}, cites = {0}, citedby = {0}, journal = {Math. Log. Q.}, volume = {29}, number = {10}, pages = {543-556}, }