@article{MZM_1976_19_3_a15,
     author = {V. T. Fomenko and P. E. Markov},
     title = {The rigidity of mirror-like protruded surfaces},
     journal = {Matemati\v{c}eskie zametki},
     pages = {469--479},
     publisher = {mathdoc},
     volume = {19},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1976_19_3_a15/}
}