@article{urn:eudml:doc:43493, title = {Homological transformations in four-dimensional space.}, journal = {Gaceta Matem\'atica}, volume = {26}, year = {1974}, pages = {77-91}, language = {en}, url = {http://dml.mathdoc.fr/item/urn:eudml:doc:43493} }
Ernesto, C.; Lindgren, S. Homological transformations in four-dimensional space.. Gaceta Matemática, Tome 26 (1974) pp. 77-91. http://gdmltest.u-ga.fr/item/urn:eudml:doc:43493/