@article{ZNSL_1988_168_a8,
     author = {G. V. Kuz'mina},
     title = {On the question of extremal properties of quadratic differentials with end domains in the structure of trajectories},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {98--113},
     publisher = {mathdoc},
     volume = {168},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1988_168_a8/}
}