@article{1258138099, author = {Ledzewicz, Urszula and Sch\"attler, Heinz and Walczak, Stanislaw}, title = {Optimal control systems governed by second-order ODEs with Dirichlet boundary data and variable parameters}, journal = {Illinois J. Math.}, volume = {47}, number = {4}, year = {2003}, pages = { 1189-1206}, language = {en}, url = {http://dml.mathdoc.fr/item/1258138099} }
Ledzewicz, Urszula; Schättler, Heinz; Walczak, Stanislaw. Optimal control systems governed by second-order ODEs with Dirichlet boundary data and variable parameters. Illinois J. Math., Tome 47 (2003) no. 4, pp. 1189-1206. http://gdmltest.u-ga.fr/item/1258138099/