Gerhard Thompson, Gerald Goertzel, and Fred Mintzer, "Recent Results in Halftoning for a 600 Pel-Per-Inch Printer," Electronic Imaging '89, Proceedings pp.
G. Goertzel, C.J. Evangelisti, J.C. Lee, F.C. Mintzer, and G.R. Thompson, "A Color Separation and Digital Halftoning Technique for Color Lithography," Electronic Imaging '87, Proceedings pp.