@article{10_14708_cm_v28i2_6234,
     author = {G. Gromadzki},
     title = {Abelian group of automorphisms of compact non-orientable {Klein} surfaces with boundary},
     journal = {Commentationes Mathematicae},
     pages = { 197--217},
     publisher = {mathdoc},
     volume = {28},
     number = {2},
     year = {1989},
     doi = {10.14708/cm.v28i2.6234},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v28i2.6234/}
}