@article{1077490471, author = {Whyburn, G. T.}, title = {The mapping of Betti groups under interior transformations}, journal = {Duke Math. J.}, volume = {4}, number = {1}, year = {1938}, pages = { 1-8}, language = {en}, url = {http://dml.mathdoc.fr/item/1077490471} }
Whyburn, G. T. The mapping of Betti groups under interior transformations. Duke Math. J., Tome 4 (1938) no. 1, pp. 1-8. http://gdmltest.u-ga.fr/item/1077490471/