F. C. Hennie One-Tape, Off-Line Turing Machine Computations [Citation Graph (0, 0)][DBLP] Information and Control, 1965, v:8, n:6, pp:553-578 [Journal]
Imsong Lee Optimal Trajectory, Guidance, and Conjugate Points [Citation Graph (0, 0)][DBLP] Information and Control, 1965, v:8, n:6, pp:589-606 [Journal]