Geodesic
Structure of groups of nonlinear automorphisms for $(3,3)$ quadrics
Matematičeskie zametki, Tome 59 (1996) no. 2, pp. 164-173

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We study the group of nonlinear automorphisms for $(k,n)$ quadrics. We prove that this group is nilpotent and describe the multiplication law for this group in terms of the corresponding Lie algebra. For nonlinear automorphisms of $(3,3)$ quadrics, explicit formulas are obtained. 
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     author = {A. F. Arbatskii},
     title = {Structure of groups of nonlinear automorphisms for $(3,3)$ quadrics},
     journal = {Matemati\v{c}eskie zametki},
     pages = {164--173},
     publisher = {mathdoc},
     volume = {59},
     number = {2},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1996_59_2_a1/}
}
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A. F. Arbatskii. Structure of groups of nonlinear automorphisms for $(3,3)$ quadrics. Matematičeskie zametki, Tome 59 (1996) no. 2, pp. 164-173. http://geodesic.mathdoc.fr/item/MZM_1996_59_2_a1/