Sketchpad III: A Computer Program for Drawing in Three Dimensions
Timothy E. Johnson.
Proceedings of the 1963 Spring Joint Computer Conference, E. Calvin Johnson, Vol. 23, AFIPS Conference Proceedings, pp. 347--353, Baltimore, MD, American Federation of Information Processing Societies, Spartan Books Inc.,
1963. [BibTeX]
Sketchpad: A Man-Machine Graphical Communication System
Author(s): Ivan E. Sutherland.
Proceedings: Proceedings of the 1963 Spring Joint Computer Conference, E. Calvin Johnson, Vol. 23, pp. 329--346, American Federation of Information Processing Societies, Spartan Books,
1963.
[BibTeX] [DOI] 
Abstract:
The Sketchpad system makes it possible for a man and a computer to converse rapidly through the medium of line drawings. Heretofore, most interaction between man and computers has been slowed down by the need to reduce all communication to written statements that can be typed; in the past, we have been writing letters to rather than conferring with our computers, For many types of communication, such as describing the shape of a mechanical part or the connections of an electrical circuit, typed statements can prove cumbersome. The Sketehpad system, by eliminating typed statements (except for legends) in favor of line drawings, opens up a new area of man-machine communication.
Sketchpad: A Man-Machine Graphical Communication System
Ivan E. Sutherland.
Massachusetts Institute of Technology, Lincoln Lab,
1963. [BibTeX]