Tags and the Evolution of Cooperation in Complex Environments. - Lee Spector; Jon Klein; Chris Perry (AAAI Technical Report (2), 2004)

Teaching the evolution of behavior with SuperDuperWalker. - Lee Spector; Jon Klein; Kyle Ira Harrington; Raymond Coppinger (AIED, 2005)

The Push3 execution stack and the evolution of control. - Lee Spector; Jon Klein; Maarten Keijzer (GECCO, 2005)

Emergence of Collective Behavior in Evolving Populations of Flying Agents. - Lee Spector; Jon Klein; Chris Perry; Mark Feinstein (Genet. Program. Evolvable Mach., 2005)

Genetic Stability and Territorial Structure Facilitate the Evolution of Tag-Mediated Altruism. - Lee Spector; Jon Klein (Artif. Life, 2006)

Unwitting distributed genetic programming via asynchronous JavaScript and XML. - Jon Klein; Lee Spector (GECCO, 2007)

Division blocks and the open-ended evolution of development, form, and behavior. - Lee Spector; Jon Klein; Mark Feinstein (GECCO, 2007)

Genetic programming for finite algebras. - Lee Spector; David M. Clark; Ian Lindsay; Bradford Barr; Jon Klein (GECCO, 2008)

Machine invention of quantum computing circuits by means of genetic programming. - Lee Spector; Jon Klein (Artif. Intell. Eng. Des. Anal. Manuf., 2008)

Push: genetic programming for finite algebras. - Lee Spector; Nicholas Freitag McPhee; David M. Clark; Ian Lindsay; Bradford Barr; Jon Klein (GECCO (Companion), 2019)