@article{CMUC_1988__29_3_a12,
     author = {Sasin, Wies{\l}aw},
     title = {On equivalence relations on a differential space},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {529--539},
     publisher = {mathdoc},
     volume = {29},
     number = {3},
     year = {1988},
     mrnumber = {972834},
     zbl = {0679.58001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1988__29_3_a12/}
}