@article{paperid:1035546, author = {Effati, Sohrab and H. Saberi Nik and M. Shirazian}, title = {ANALYTIC-APPROXIMATE SOLUTION FOR A CLASS OF NONLINEAR OPTIMAL CONTROL PROBLEMS BY HOMOTOPY ANALYSIS METHOD}, journal = {Asian-European Journal of Mathematics}, year = {2013}, volume = {06}, number = {2}, month = {September}, issn = {1793-5571}, pages = {1350012--22}, numpages = {-1349990}, keywords = {Homotopy analysis method; optimal control problems; Pontryagin’s maximum principle; Hamiltonian system.}, }