J. Lawrence, ?. C. Brukner, and A. Zeilinger, Mutually unbiased binary observable sets on N qubits, Physical Review A65, p.32320, 2002.

S. Ball and P. J. Cameron, The geometry of finite fields Quaderni Elettronici del Sem- inario di Geometria Combinatoria 2E (2001); available on-line from http://www.mat.uniroma1.it, Projective and polar spaces

D. Clerck, F. , V. Maldeghem, and H. , Ovoids and spreads of polar spaces and generalized polygons, " a lecture given at an intensive course on " Galois Geometry and Generalized Polygons, 1998.

J. A. Thas, Ovoids and spreads of finite classical polar spaces, Geometriae Dedicata, vol.29, issue.1-4, pp.135-144, 1981.
DOI : 10.1007/BF01447417

W. K. Wootters, Picturing qubits in phase space, IBM Journal of Research and Development, vol.48, issue.1, pp.99-110, 2004.
DOI : 10.1147/rd.481.0099

M. Saniga, M. Planat, and P. Pracna, Projective ring line encompassing two-qubits Theoretical and Mathematical Physics, submitted; quant-ph, pp.611063-611067
DOI : 10.1007/s11232-008-0076-x
URL : http://arxiv.org/abs/quant-ph/0611063