@article{KJM_2005_28_1_a5,
     author = {Stefan Haesen},
     title = {Optimal inequalities for embedded space-times},
     journal = {Kragujevac Journal of Mathematics},
     pages = {69 - 85},
     publisher = {mathdoc},
     volume = {28},
     number = {1},
     year = {2005},
     zbl = {1119.53037},
     url = {http://geodesic.mathdoc.fr/item/KJM_2005_28_1_a5/}
}