@article{MZ_1990__205_3_174185,
     author = {Darryl McCullough},
     title = {Minimal genus of abelian actions on {Klein} surfaces with boundary.},
     journal = {Mathematische Zeitschrift},
     pages = {421--436},
     publisher = {mathdoc},
     volume = {205},
     number = {3},
     year = {1990},
     zbl = {0755.57005},
     url = {http://geodesic.mathdoc.fr/item/MZ_1990__205_3_174185/}
}