@article{ISU_2012_12_3_a5,
     author = {L. N. Romakina},
     title = {Oval lines of the hyperbolic plane of positive curvature},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {37--44},
     publisher = {mathdoc},
     volume = {12},
     number = {3},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2012_12_3_a5/}
}