An Interactive System for Reading Unformatted Printed Text. - Robert N. Ascher; George M. Koppelman; Martha J. Miller; George Nagy; Glenmore L. Shelton Jr. (IEEE Trans. Computers, 1971)

Verifying deep logic hierarchies with ALEX. - George M. Koppelman; Klim Maling (DAC, 1980)

OYSTER: A Study of Integrated Circuits as Three Dimensional Structures. - George M. Koppelman; Michael A. Wesley (IBM J. Res. Dev., 1983)

PSI: A Symbolic Layout System. - Rolf-Dieter Fiebrich; Yuh-Zen Liao; George M. Koppelman; Edward N. Adams (IBM J. Res. Dev., 1984)