Whorf: A Visualization Tool for Software Maintenance. - Kathleen Brade; Mark Guzdial; Mark Steckel; Elliot Soloway (VL, 1992)

Whorf: a Hypertext Tool for Software Maintenance. - Kathleen Brade; Mark Guzdial; Mark Steckel; Elliot Soloway (Int. J. Softw. Eng. Knowl. Eng., 1994)