@article{GDZPPN002335794,
title = {Algebraic dimension of twistor spaces and scalar curvature of anti-self-dual metrics.},
journal = {Mathematische Annalen},
volume = {291},
year = {1991},
pages = {113-122},
zbl = {0747.32021},
url = {http://dml.mathdoc.fr/item/GDZPPN002335794}
}
Pontecorvo, Massimiliano. Algebraic dimension of twistor spaces and scalar curvature of anti-self-dual metrics.. Mathematische Annalen, Tome 291 (1991) pp. 113-122. http://gdmltest.u-ga.fr/item/GDZPPN002335794/