@article{AFM_1990_15_2_a2,
     author = {A.J. Alonso Gomez and A. Fernandez Arias},
     title = {The space of extensions of a {Klein} surface of finite genus},
     journal = {Annales Fennici Mathematici},
     pages = {247--259},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {1990},
     doi = {10.5186/aasfm.1990.1501},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1990.1501/}
}