TY  - JOUR
AU  - W. Słowikowski
TI  - A theory of extensions of map-systems I
JO  - Fundamenta Mathematicae
PY  - 1958
SP  - 243
EP  - 275
VL  - 46
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/fm-46-3-243-275/
DO  - 10.4064/fm-46-3-243-275
LA  - en
ID  - 10_4064_fm_46_3_243_275
ER  -