@article{IM2_1980_14_1_a0,
     author = {A. I. Gryuntal'},
     title = {The existence of convex spherical metrics, all closed nonselfintersecting geodesics of which are hyperbolic},
     journal = {Izvestiya. Mathematics },
     pages = {1--16},
     publisher = {mathdoc},
     volume = {14},
     number = {1},
     year = {1980},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1980_14_1_a0/}
}