Simulation modeling in an object-oriented environment using Smalltalk-80. - Onur M. Ülgen; Timothy Thomasma (WSC, 1986)

Modeling of a manufacturing cell using a graphical simulation system based on Smalltalk-80. - Timothy Thomasma; Onur M. Ülgen (WSC, 1987)

Hierarchical, modular simulation modeling in icon-based simulation program generators for manufacturing. - Timothy Thomasma; Onur M. Ülgen (WSC, 1988)

Object oriented toolkits for simulation program generators. - Onur M. Ülgen; Timothy Thomasma; Youyi Mao (WSC, 1989)

Object oriented programming languages for developing simulation-related software. - Timothy Thomasma; James Madsen (WSC, 1990)

Reusable models: making your models more user-friendly. - Onur M. Ülgen; Norm Otto; Timothy Thomasma (WSC, 1991)

A visual programming system for defining behavior in simulation models of manufacturing systems. - Timothy Thomasma; Youyi Mao; Onur M. Ülgen (Ann. Oper. Res., 1994)