@article{10_4064_cm127_2_3,
     author = {Ewa Tyszkowska},
     title = {Theory of coverings in the study of
 {Riemann} surfaces},
     journal = {Colloquium Mathematicum},
     pages = {173--184},
     publisher = {mathdoc},
     volume = {127},
     number = {2},
     year = {2012},
     doi = {10.4064/cm127-2-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm127-2-3/}
}