TY  - RPRT
TI  - A Simple Calculus for Discrete Systems, Part B
AU  - Leonard, J. N.
AU  - Pixley, A. F.
AU  - Wulff, J. J.
PY  - 1968
UR  - https://ntrs.nasa.gov/citations/19680004795
ID  - 19680004795
ER  -