@article{KJM_2003_25_1_a12,
     author = {S. Haesen and A. \v{S}ebekovi\'c and L. Verstraelen},
     title = {Relations between intrinsic and extrinsic curvatures},
     journal = {Kragujevac Journal of Mathematics},
     pages = {139 - 145},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {2003},
     url = {http://geodesic.mathdoc.fr/item/KJM_2003_25_1_a12/}
}