@article{MZM_1993_53_5_a0,
     author = {S. Kh. Aranson and E. V. Zhuzhoma},
     title = {Trajectories covering flows for branched coverings of the sphere and projective plane},
     journal = {Matemati\v{c}eskie zametki},
     pages = {3--13},
     year = {1993},
     volume = {53},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1993_53_5_a0/}
}