@article{10_4064_fm_54_1_27_29,
     author = {Andrzej Grzegorczyk},
     title = {A note on the theory of propositional types},
     journal = {Fundamenta Mathematicae},
     pages = {27--29},
     publisher = {mathdoc},
     volume = {54},
     number = {1},
     year = {1964},
     doi = {10.4064/fm-54-1-27-29},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-54-1-27-29/}
}