TY  - JOUR
AU  - Marcin E. Kuczma
TI  - On permutations involving pairs of twins.
JO  - Elemente der Mathematik
PY  - 1991
SP  - 78
EP  - 83
VL  - 46
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ELMA_1991__46_2_141506/
ID  - ELMA_1991__46_2_141506
ER  -