Interactive circuit design program in APL. - David A. Zein; C. W. Ho; Algirdas J. Gruodis (APL, 1983)

Techniques for extracting statistical data from free-form text using APL. - L. Owen Hill; David A. Zein (APL, 1987)

Automatic generation of graphs from free-form text using APL. - L. Owen Hill; David A. Zein (APL, 1987)

HLSIM - A New Hierarchical Logic Simulator and Netlist Converter. - David A. Zein; Oliver P. Engel; Gary S. Ditlow (DAC, 1992)

Algorithms for the design verification of bipolar array chips. - David A. Zein; Oliver P. Engel; Gary S. Ditlow (VTS, 1992)

HLSIM-a new hierarchical logic simulator in APL. - David A. Zein; Oliver P. Engel; Gary S. Ditlow (VTS, 1992)