@article{MZM_1967_1_6_a13,
     author = {A. L. Verner and S. A. Frangulov},
     title = {Total curvature of non-compact two-dimensional manifolds of bounded curvature},
     journal = {Matemati\v{c}eskie zametki},
     pages = {727--734},
     publisher = {mathdoc},
     volume = {1},
     number = {6},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1967_1_6_a13/}
}