TY - JOUR AU - G. Gromadzki TI - Abelian group of automorphisms of compact non-orientable Klein surfaces with boundary JO - Commentationes Mathematicae PY - 1989 SP - 197 EP - 217 VL - 28 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.14708/cm.v28i2.6234/ DO - 10.14708/cm.v28i2.6234 LA - pl ID - 10_14708_cm_v28i2_6234 ER -