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@article{IM_1969__7_141954, author = {G.E. BREDON and J.W. WOOD}, title = {Non-Orientable {Surfaces} in {Orientable} {3-Manifolds.}}, journal = {Inventiones mathematicae}, pages = {83--110}, publisher = {mathdoc}, volume = {7}, year = {1969}, zbl = {0175.20504}, url = {http://geodesic.mathdoc.fr/item/IM_1969__7_141954/} }
G.E. BREDON; J.W. WOOD. Non-Orientable Surfaces in Orientable 3-Manifolds.. Inventiones mathematicae, Tome 7 (1969), pp. 83-110. http://geodesic.mathdoc.fr/item/IM_1969__7_141954/