@article{10_4064_aa_25_4_337_346,
     author = {R. Cook},
     title = {Simultaneous quadratic inequalities},
     journal = {Acta Arithmetica},
     pages = {337--346},
     year = {1973},
     volume = {25},
     number = {4},
     doi = {10.4064/aa-25-4-337-346},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-25-4-337-346/}
}