TY  - JOUR
AU  - Hans Michael Unsöld
TI  - A4n-polyhedra with free homology.
JO  - Manuscripta mathematica
PY  - 1989
SP  - 123
EP  - 146
VL  - 65
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MM2_1989__65_3_155430/
ID  - MM2_1989__65_3_155430
ER  -