@article{CMUC_1989__30_1_a20,
     author = {Witzany, Ji\v{r}{\'\i}},
     title = {Correspondence between interval $\pi$-equivalences and $Sd$-functions},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {175--187},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1989},
     mrnumber = {995716},
     zbl = {0672.03035},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1989__30_1_a20/}
}