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@article{MAN_1931__105_159533, author = {J. Douglas}, title = {Systems of {K-dimensional} manifolds in an {N-dimensional} space}, journal = {Mathematische Annalen}, pages = {707--733}, publisher = {mathdoc}, volume = {105}, year = {1931}, zbl = {0003.16902}, url = {http://geodesic.mathdoc.fr/item/MAN_1931__105_159533/} }
J. Douglas. Systems of K-dimensional manifolds in an N-dimensional space. Mathematische Annalen, Tome 105 (1931), pp. 707-733. http://geodesic.mathdoc.fr/item/MAN_1931__105_159533/