1. Partial spreads in finite projective spaces and partial designs;Beutelspacher;Math. Z.,1975
2. Projective Geometry: From Foundations to Applications;Beutelspacher,1998
3. Linearity and complements in projective space;Braun;Linear Algebra Appl.,2013
4. A. Chowdhury, personal communication (see also Shadows and intersections in vector spaces, http://ima.umn.edu/~ameera/research/shadow-int-vec-space-extended.pdf 2009).
5. Bilinear forms over a finite field, with applications to coding theory;Delsarte;J. Combin. Theory Ser. A,1978