Animation of plant development. - Przemyslaw Prusinkiewicz; Mark Hammel; Eric Mjolsness (SIGGRAPH, 1993)

Visualization of Developmental Processes by Extrusion in Space-time. - Mark Hammel; Przemyslaw Prusinkiewicz (Graphics Interface, 1996)

Visual Models of Plant Development. - Przemyslaw Prusinkiewicz; Mark Hammel; Jim Hanan; Radomír Mech (Handbook of Formal Languages (3), 1997)

Stylized flowing hair controlled with NURBS surfaces. - Ramón Montoya-Vozmediano; Mark Hammel (SIGGRAPH Abstracts and Applications, 2002)

Tile representation of subdivision surfaces. - Carlos Gonzalez-Ochoa; Mark Hammel (SIGGRAPH, 2003)