@article{CMUC_2007__48_1_a1,
     author = {Ne\v{s}et\v{r}il, J. and Pultr, A. and Tardif, C.},
     title = {Gaps and dualities in {Heyting} categories},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {9--23},
     publisher = {mathdoc},
     volume = {48},
     number = {1},
     year = {2007},
     mrnumber = {2338826},
     zbl = {1199.18009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2007__48_1_a1/}
}