Charcoal Sketching: Returning Control to the Artist
Author(s): Teresa W. Bleser, John L. Sibert, J. Patrick McGee.
Article: ACM Transactions on Graphics, Vol. 7, No. 1, pp. 76--81, January,
1988.
[BibTeX] 
Abstract:
The technique allows a user to draw lines with constantly varying size,
shape, texture, and weight (see Figure 1) and allows the user to control all of
these variables with one continuous action. It directly relates physical action to
effect in a natural way.
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