@article{JRAM_1989__398_153150,
     author = {R. Sridharan and M.-A. Knus and R. Parimala},
     title = {A classification of rank 6 quadratic spaces via pfaffians.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {187--218},
     publisher = {mathdoc},
     volume = {398},
     year = {1989},
     zbl = {0664.10008},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1989__398_153150/}
}