1. Presented as Preprint 65-62 at the AIAA 2nd Aerospace Sciences Meeting, New York, N. Y., January25-27,1965; revision received July 12, 1965. This work was performed under NASA Contract NAS7-200.
2. Denbow, C. H. "A generalized form of the problem of Bolza," Ph.D. Thesis, Univ. of Chicago (1937); also Contributions to theCalculus of Variations (University of Chicago Press, Chicago, 111., 1933-1937), 243-275.