TY  - JOUR
AU  - Laffey, Thomas J.
TI  - On a question of Hills concerning co-transposers
JO  - Portugaliae mathematica
PY  - 1985
SP  - 179
EP  - 187
VL  - 43
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1985__43_1_114498/
LA  - en
ID  - PORMA_1985__43_1_114498
ER  -