@article{MM2_1995__87_4_156099,
     author = {Rolf B\"oning},
     title = {Curvature surfaces of {Hopf} {Hypersurfaces} in complex space forms.},
     journal = {Manuscripta mathematica},
     pages = {449--458},
     publisher = {mathdoc},
     volume = {87},
     number = {4},
     year = {1995},
     zbl = {0857.53013},
     url = {http://geodesic.mathdoc.fr/item/MM2_1995__87_4_156099/}
}