@inproceedings{SchoepfDeuflhard1994, author = {R. Sch{\"o}pf and Peter Deuflhard}, title = {OCCAL. A mixed symbolic-numeric optimal control calculator}, booktitle = {Computational optimal control}, editor = {R. et al. Bulirsch}, volume = {115}, pages = {269 -- 278}, year = {1994}, }