@article{NSJOM_2012_42_2a_1,
     author = {S. S. Shukla, and Pawan Kumar Rao},
     title = {Some inequalities on invariant submanifolds
 in quaternion space forms},
     journal = {Novi Sad Journal of Mathematics},
     pages = {9-18},
     publisher = {mathdoc},
     volume = {42},
     number = {2},
     year = {2012},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2012_42_2a_1/}
}