@article{ZNSL_2006_337_a7,
     author = {E. G. Emel'yanov},
     title = {On quadratic differentials on multiply connected domains that are perfect squares},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {113--133},
     publisher = {mathdoc},
     volume = {337},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2006_337_a7/}
}