@article{AA_1998_10_4_a2,
     author = {Yu. D. Burago and S. V. Buyalo},
     title = {Metrics with upper-bounded curvature on $2${-polyhedra.~II}},
     journal = {Algebra i analiz},
     pages = {62--112},
     publisher = {mathdoc},
     volume = {10},
     number = {4},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1998_10_4_a2/}
}