@article{1029002161, author = {Jerrard, Richard}, title = {A stronger invariant for homology theory.}, journal = {Michigan Math. J.}, volume = {26}, number = {1}, year = {1979}, pages = { 33-46}, language = {en}, url = {http://dml.mathdoc.fr/item/1029002161} }
Jerrard, Richard. A stronger invariant for homology theory.. Michigan Math. J., Tome 26 (1979) no. 1, pp. 33-46. http://gdmltest.u-ga.fr/item/1029002161/