@article{10_4064_cm98_2_5,
     author = {Ziqi Sun},
     title = {A pinching theorem on complete 
submanifolds with parallel mean curvature vectors},
     journal = {Colloquium Mathematicum},
     pages = {189--199},
     publisher = {mathdoc},
     volume = {98},
     number = {2},
     year = {2003},
     doi = {10.4064/cm98-2-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm98-2-5/}
}