Polynomial-time computing over quadratic maps i: sampling in real algebraic sets.

Dima Grigoriev Dmitrii V. Pasechnik Polynomial-time computing over quadratic maps i: sampling in real algebraic sets. 20-52 2005 14 Computational Complexity 1 http://dx.doi.org/10.1007/s00037-005-0189-7 db/journals/cc/cc14.html#GrigorievP05