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@article{MAN_1974__207_162542, author = {Thomas F. Banchoff}, title = {Tight {Polyhedral} {Klein} {Bottles,} {Projective} {Planes,} and {M\"obius} {Bands.}}, journal = {Mathematische Annalen}, pages = {233--244}, publisher = {mathdoc}, volume = {207}, year = {1974}, zbl = {0275.57005}, url = {http://geodesic.mathdoc.fr/item/MAN_1974__207_162542/} }
Thomas F. Banchoff. Tight Polyhedral Klein Bottles, Projective Planes, and Möbius Bands.. Mathematische Annalen, Tome 207 (1974), pp. 233-244. http://geodesic.mathdoc.fr/item/MAN_1974__207_162542/