@article{ZNSL_2013_415_a14,
     author = {L. N. Romakina},
     title = {Cycles of the hyperbolic plane of positive curvature},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {137--162},
     year = {2013},
     volume = {415},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2013_415_a14/}
}