@article{MAN_1990__288_1_164725,
     author = {R. Sujatha},
     title = {Witt groups of real projective surfaces.},
     journal = {Mathematische Annalen},
     pages = {89--102},
     publisher = {mathdoc},
     volume = {288},
     number = {1},
     year = {1990},
     zbl = {0692.14012},
     url = {http://geodesic.mathdoc.fr/item/MAN_1990__288_1_164725/}
}