Geodesic
Invariants of CR-manifolds associated with the tangent quadric
Matematičeskie zametki, Tome 59 (1996) no. 1, pp. 42-52

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We construct a system of $\operatorname{CR}$-invariants of a manifold generated by projective invariants of the tangent quadric. We present a description of the group of projective diffeomorphisms of a quartic. We also estimate the degree of a rational mapping of a quartic. The description problem for subgroups of a Cremona group of bounded degree is posed. 
@article{MZM_1996_59_1_a3,
     author = {V. K. Beloshapka},
     title = {Invariants of {CR-manifolds} associated with the tangent quadric},
     journal = {Matemati\v{c}eskie zametki},
     pages = {42--52},
     publisher = {mathdoc},
     volume = {59},
     number = {1},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1996_59_1_a3/}
}
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V. K. Beloshapka. Invariants of CR-manifolds associated with the tangent quadric. Matematičeskie zametki, Tome 59 (1996) no. 1, pp. 42-52. http://geodesic.mathdoc.fr/item/MZM_1996_59_1_a3/