@article{TM_2015_288_a11,
     author = {M. I. Shtogrin},
     title = {On flexible polyhedral surfaces},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {171--183},
     year = {2015},
     volume = {288},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2015_288_a11/}
}