@article{ZNSL_2015_434_a7,
     author = {A. B. Zaitsev},
     title = {On the univalence of solutions of second order elliptic equations in the unit disk on the plane},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {91--100},
     publisher = {mathdoc},
     volume = {434},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2015_434_a7/}
}