@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/