TY  - JOUR
AU  - Marek Lassak
AU  - Andrzej Prószynski
TI  - Algebraic and geometric approach to the classification of semispaces.
JO  - Mathematica Scandinavica
PY  - 1987
SP  - 204
EP  - 212
VL  - 61
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MS2_1987__61_2_186096/
ID  - MS2_1987__61_2_186096
ER  -