@article{10_2298_PIM0578135R,
     author = {Boris Rosenfeld},
     title = {Holomorphy {Angles} and {Sectional} {Curvature} in {Hermitian} {Elliptic} {Planes} {Over} {Fields} and {Tensor} {Products} of {Fields}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {135 },
     publisher = {mathdoc},
     volume = {_N_S_78},
     number = {92},
     year = {2005},
     doi = {10.2298/PIM0578135R},
     zbl = {1119.32010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.2298/PIM0578135R/}
}