@article{10_1007_s10587_015_0169_2,
     author = {Pak, Eunmi and de Dios P\'erez, Juan and Machado, Carlos J. G. and Woo, Changhwa},
     title = {Hopf hypersurfaces in complex two-plane {Grassmannians} with generalized {Tanaka-Webster} parallel normal {Jacobi} operator},
     journal = {Czechoslovak Mathematical Journal},
     pages = {207--218},
     publisher = {mathdoc},
     volume = {65},
     number = {1},
     year = {2015},
     doi = {10.1007/s10587-015-0169-2},
     mrnumber = {3336034},
     zbl = {06433730},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10587-015-0169-2/}
}