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@article{PORMA_1948__7_2_114664, author = {Fitch, Frederic B.}, title = {Intuitionistic modal logic with quantifiers}, journal = {Portugaliae mathematica}, pages = {113--118}, publisher = {mathdoc}, volume = {7}, number = {2}, year = {1948}, mrnumber = {0029844}, zbl = {0036.00804}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1948__7_2_114664/} }
Fitch, Frederic B. Intuitionistic modal logic with quantifiers. Portugaliae mathematica, Tome 7 (1948) no. 2, pp. 113-118. http://geodesic.mathdoc.fr/item/PORMA_1948__7_2_114664/