@article{10_4064_fm_82_4_307_322,
     author = {A. Troelstra},
     title = {Non-extensional equality},
     journal = {Fundamenta Mathematicae},
     pages = {307--322},
     publisher = {mathdoc},
     volume = {82},
     number = {4},
     year = {1974},
     doi = {10.4064/fm-82-4-307-322},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-82-4-307-322/}
}