@article{GDZPPN000365963,
title = {Feasibility Testing for Systems of Real Quadratic Equations.},
journal = {Discrete \& computational geometry},
volume = {10},
year = {1993},
pages = {1-14},
zbl = {0812.12006},
url = {http://dml.mathdoc.fr/item/GDZPPN000365963}
}
Barvinok, A.I. Feasibility Testing for Systems of Real Quadratic Equations.. Discrete & computational geometry, Tome 10 (1993) pp. 1-14. http://gdmltest.u-ga.fr/item/GDZPPN000365963/