@article{1102986505, author = {Christenson, C. O. and Osborne, R. P.}, title = {Pointlike subsets of a manifold.}, journal = {Pacific J. Math.}, volume = {27}, number = {3}, year = {1968}, pages = { 431-435}, language = {en}, url = {http://dml.mathdoc.fr/item/1102986505} }
Christenson, C. O.; Osborne, R. P. Pointlike subsets of a manifold.. Pacific J. Math., Tome 27 (1968) no. 3, pp. 431-435. http://gdmltest.u-ga.fr/item/1102986505/