@article{MZM_2017_102_4_a6,
     author = {E. Johnstone},
     title = {Birationally {Rigid} {Singular} {Double} {Quadrics} and {Double} {Cubics}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {549--558},
     publisher = {mathdoc},
     volume = {102},
     number = {4},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2017_102_4_a6/}
}