@article{04029235, title = {Multifacility location problems on a sphere.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {10}, year = {1987}, pages = {583-596}, doi = {10.1155/S0161171287000693}, zbl = {0632.90022}, language = {en}, url = {http://dml.mathdoc.fr/item/04029235} }
Aykin, Turgut; Babu, A.J.G. Multifacility location problems on a sphere.. International Journal of Mathematics and Mathematical Sciences, Tome 10 (1987) pp. 583-596. doi : 10.1155/S0161171287000693. http://gdmltest.u-ga.fr/item/04029235/