TY  - JOUR
AU  - Wilker, J. B.
TI  - Russian Dolls
JO  - Canadian mathematical bulletin
PY  - 1978
SP  - 237
EP  - 240
VL  - 21
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1978-039-x/
DO  - 10.4153/CMB-1978-039-x
ID  - 10_4153_CMB_1978_039_x
ER  -