@article{00942899, title = {On Bellman spheres for linear controlled objects of second order.}, journal = {Journal of Applied Analysis}, volume = {1}, year = {1995}, pages = {13-27}, doi = {10.1515/JAA.1995.13}, zbl = {0917.49002}, language = {en}, url = {http://dml.mathdoc.fr/item/00942899} }
Boltyanski, V.G.; Marti Vazques, J. On Bellman spheres for linear controlled objects of second order.. Journal of Applied Analysis, Tome 1 (1995) pp. 13-27. doi : 10.1515/JAA.1995.13. http://gdmltest.u-ga.fr/item/00942899/