no. 1
Orthogonal, symplectic and unitary polar spaces sub-weakly embedded in projective space
Compositio Mathematica, Tome 103 (1996) no. 1, pp. 75-93. 
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Thas, J. A.; Van Maldeghem, H. Orthogonal, symplectic and unitary polar spaces sub-weakly embedded in projective space. Compositio Mathematica, Tome 103 (1996) no. 1, pp. 75-93. http://www.numdam.org/item/CM_1996__103_1_75_0/

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