TY  - JOUR
AU  - K. Sieklucki
TI  - An inductive proof of the non-retractibility of a cell onto its boundary
JO  - Commentationes Mathematicae
PY  - 1983
SP  -  129
EP  - 131
VL  - 23
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.14708/cm.v23i1.6047/
DO  - 10.14708/cm.v23i1.6047
LA  - pl
ID  - 10_14708_cm_v23i1_6047
ER  -