@article{MZ_1995__219_2_174759,
     author = {Barbara Opozda},
     title = {A class of projectively flat surfaces.},
     journal = {Mathematische Zeitschrift},
     pages = {77--92},
     publisher = {mathdoc},
     volume = {219},
     number = {2},
     year = {1995},
     zbl = {0823.53012},
     url = {http://geodesic.mathdoc.fr/item/MZ_1995__219_2_174759/}
}