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@article{PORMA_1985__43_1_114498, author = {Laffey, Thomas J.}, title = {On a question of {Hills} concerning co-transposers}, journal = {Portugaliae mathematica}, pages = {179--187}, publisher = {mathdoc}, volume = {43}, number = {1}, year = {1985}, mrnumber = {0875066}, zbl = {0591.15006}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1985__43_1_114498/} }
Laffey, Thomas J. On a question of Hills concerning co-transposers. Portugaliae mathematica, Tome 43 (1985) no. 1, pp. 179-187. http://geodesic.mathdoc.fr/item/PORMA_1985__43_1_114498/