@article{MASLO_1975__25_4_a7,
     author = {Hejn\'y, Milan},
     title = {Klein {Hyperbottle}},
     journal = {Mathematica slovaca},
     pages = {369--371},
     publisher = {mathdoc},
     volume = {25},
     number = {4},
     year = {1975},
     mrnumber = {0433461},
     zbl = {0322.57007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1975__25_4_a7/}
}