@article{2161, author = {Pereira Coelho, R.}, title = {On the groups of certain linkages}, journal = {Portugaliae mathematica}, volume = {6}, year = {1947}, pages = {57-65}, zbl = {0035.25103}, mrnumber = {0024124}, language = {en}, url = {http://dml.mathdoc.fr/item/2161} }
Pereira Coelho, R. On the groups of certain linkages. Portugaliae mathematica, Tome 6 (1947) pp. 57-65. http://gdmltest.u-ga.fr/item/2161/