@article{PORMA_1995__52_1_47480,
     author = {Scherwentke, Przemys{\l}aw},
     title = {On the geometry of  and .},
     journal = {Portugaliae mathematica},
     pages = {49--59},
     publisher = {mathdoc},
     volume = {52},
     number = {1},
     year = {1995},
     zbl = {0844.47024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1995__52_1_47480/}
}