@article{article6d77095e,
title   = {Realization of primitive branched coverings over closed surfaces following the Hurwitz approach},
author = {Bogatyi, Semeon A. and Gonçalves, Daciberg Lima and Kudryavtseva, Elena A. and Zieschang, Heiner},
year = {2003},
doi = {10.2478/BF02476007},
journal   = {Central European Journal of Mathematics}
}