@article{JGG_2005_9_1_JGG_2005_9_1_a3,
     author = {M. Hajja and P. Walker },
     title = {Equifaciality of {Tetrahedra} whose {Incenter} and {Fermat-Torricelli} {Center} {Coincide}},
     journal = {Journal for geometry and graphics},
     pages = {37--41},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {2005},
     url = {http://geodesic.mathdoc.fr/item/JGG_2005_9_1_JGG_2005_9_1_a3/}
}