@article{KJM_2013_37_1_a0,
     author = {Leopold Verstraelen},
     title = {Geometry of {Submanifolds.} {I.} {The} first {Casorati} curvature indicatrices},
     journal = {Kragujevac Journal of Mathematics},
     pages = {5 },
     year = {2013},
     volume = {37},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/KJM_2013_37_1_a0/}
}