%0 Journal Article %A Hyunjin Lee %A Seonhui Kim %T Hopf Hypersurfaces with $\eta$-Parallel Shape Operator in Complex Two-Plane Grassmannians %J Bulletin of the Malaysian Mathematical Society %D 2013 %V 36 %N 4 %U http://geodesic.mathdoc.fr/item/BMMS_2013_36_4_a8/ %F BMMS_2013_36_4_a8