"The use of positional information in the modeling of plants"
Przemyslaw Prusinkiewicz, Lars Mündermann, Radoslaw Karwowski, Brendan Lane
ACM SIGGRAPH 2001 Proceedings, pp. 289-300

"A Collision-based Model of Spiral Phyllotaxis"
Deborah R. Fowler, Przemyslaw Prusinkiewicz, Johannes Batjes
ACM SIGGRAPH 1992 Proceedings, pp. 361-368

"Realistic Modeling and Rendering of Plant Ecosystems"
Oliver Deussen, Pat Hanrahan, Bernd Lintermann, Radomir Mech,
Matt Pharr, Przemyslaw Prusinkiewicz
ACM SIGGRAPH 1998 Proceedings, pp. 275-286