TY  - RPRT
TI  - Singular optimal control and the identically non-regular problem in the calculus of variations
AU  - Menon, P. K. A.
AU  - Kelley, H. J.
AU  - Cliff, E. M.
PY  - 1985
UR  - https://ntrs.nasa.gov/citations/19860048391
ID  - 19860048391
ER  -