Imperfection for realistic image synthesis. - Welton Becket; Norman I. Badler (Comput. Animat. Virtual Worlds, 1990)

Terrain reasoning for human locomotion. - Barry D. Reich; Hyeong-Seok Ko; Welton Becket; Norman I. Badler (CA, 1994)

Behavioral Control for Real-Time Simulated Human Agents. - John P. Granieri; Welton Becket; Barry D. Reich; Jonathan Crabtree; Norman I. Badler (SI3D, 1995)