Bellman, R. E., & Bellman, R. E. C. (1963). Differential-difference equations. Rand Corp..
Chicago Edition CitationBellman, Richard Ernest, and Richard Ernest; Cooke Bellman. Differential-difference Equations. Santa Monica, Calif.: Rand Corp., 1963.
MLA Edition CitationBellman, Richard Ernest, and Richard Ernest; Cooke Bellman. Differential-difference Equations. Rand Corp., 1963.
Warning: These citations may not always be 100% accurate.