@article{10_1017_S001708950003130X,
     author = {Chen, Bang-Yen},
     title = {Mean curvature and shape operator of isometric immersions in real-space-forms},
     journal = {Glasgow mathematical journal},
     pages = {87--97},
     year = {1996},
     volume = {38},
     number = {1},
     doi = {10.1017/S001708950003130X},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S001708950003130X/}
}