A Bidirectional Deposition Model of Wax Crayons
Dave Rudolf, David Mould, Eric Neufeld.
Computer Graphics Forum, Vol. 24, No. 1, pp. 27--39, March, 
2005.  [BibTeX]
 Simulating Wax Crayons
Dave Rudolf, David Mould, Eric Neufeld.
11th Pacific Conference on Computer Graphics and Applications (PG'03), 
2003.  [BibTeX]