1. Convergence of nonconvergent irk discretizations of optimal control problems with state inequality constraints;Betts;SIAM J. Sci. Comput.,2002
2. Direct transcription solution of inequality constrained optimal control problems;Betts,2004
3. J.T. Betts, S.L. Campbell, A. Engelsone. Direct transcription solution of optimal control problems with higher order state constraints: theory vs practice, Optimization and Engineering, submitted for publication
4. J.T. Betts, W.P. Huffman, Sparse optimal control software socs, Technical report, Mathematics and Engineering Analysis Technical Document MEA-LR-085, Boeing Information and Support Services, July 1997
5. N. Biehn, Implicit Runge–Kutta methods for stiff and state constrained optimal control problems, PhD thesis, North Carolina State University, 2001