@article{GDZPPN002062011,
title = {Compact Quadratic s-Manifolds},
journal = {Commentarii mathematici Helvetici},
volume = {51},
year = {1976},
pages = {105-132},
zbl = {0323.53038},
url = {http://dml.mathdoc.fr/item/GDZPPN002062011}
}
Ledger, Arthur J.; Pettitt, R. Bruce. Compact Quadratic s-Manifolds. Commentarii mathematici Helvetici, Tome 51 (1976) pp. 105-132. http://gdmltest.u-ga.fr/item/GDZPPN002062011/