@article{SM_2006_197_6_a3,
     author = {A. Yu. Kolesov and N. Kh. Rozov},
     title = {The buffer property in a non-classical hyperbolic
},
     journal = {Sbornik. Mathematics},
     pages = {853--885},
     publisher = {mathdoc},
     volume = {197},
     number = {6},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2006_197_6_a3/}
}