An Improved Plotting Package for VAXIMA. - Douglas A. Young; Paul S. Wang (European Conference on Computer Algebra (2), 1985)

GI/S: A Graphical User Interface For Symbolic Computation Systems. - Douglas A. Young; Paul S. Wang (J. Symb. Comput., 1987)

X window systems - programming and applications with Xt. - Douglas A. Young (Prentice Hall, 1989)