A digital control unit for a repetitive analog computer. - Thomas A. Brubaker; Harry R. Eckes (IRE-AIEE-ACM Computer Conference (Western), 1961)

New Analog-Computer Setup for a Bistable Element Permitting Symmetrical Triggering. - Harry R. Eckes (IRE Trans. Electron. Comput., 1962)

A Fast Mode-Control Switch for Iterative Differential Analyzers. - Harry R. Eckes (IEEE Trans. Electron. Comput., 1965)