@article{05198189, title = {Holomorphy angles and sectional curvature in Hermitian elliptic planes over fields and tensor products of fields.}, journal = {Publications de l'Institut Math\'ematique. Nouvelle S\'erie}, volume = {77(91)}, year = {2005}, pages = {135-142}, doi = {10.2298/PIM0578135R}, zbl = {1119.32010}, language = {en}, url = {http://dml.mathdoc.fr/item/05198189} }
Rosenfeld, Boris. Holomorphy angles and sectional curvature in Hermitian elliptic planes over fields and tensor products of fields.. Publications de l'Institut Mathématique. Nouvelle Série, Tome 77(91) (2005) pp. 135-142. doi : 10.2298/PIM0578135R. http://gdmltest.u-ga.fr/item/05198189/