Geodesic
Null-quadrics of codimension 4 in $\mathbb C^7$
Matematičeskie zametki, Tome 62 (1997) no. 5, pp. 657-665.

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In this paper we study the automorphisms of nondegenerate quadrics of type $(4,3)$. In particular, we classify the so-called null-quadrics (we prove that there are exactly two null-quadrics up to equivalence), and find their automorphism groups. 
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     title = {Null-quadrics of codimension 4 in $\mathbb C^7$},
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E. G. Anisova. Null-quadrics of codimension 4 in $\mathbb C^7$. Matematičeskie zametki, Tome 62 (1997) no. 5, pp. 657-665. http://geodesic.mathdoc.fr/item/MZM_1997_62_5_a1/

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