Online Negative Databases. - Fernando Esponda; Elena S. Ackley; Stephanie Forrest; Paul Helman (ICARIS, 2004)

On-line Negative Databases. - Fernando Esponda; Elena S. Ackley; Stephanie Forrest; Paul Helman (Int. J. Unconv. Comput., 2005)

Protecting Data Privacy Through Hard-to-Reverse Negative Databases. - Fernando Esponda; Elena S. Ackley; Paul Helman; Haixia Jia; Stephanie Forrest (ISC, 2006)

Negative Ternary Set-Sharing. - Eric D. Trias; Jorge A. Navas; Elena S. Ackley; Stephanie Forrest; Manuel V. Hermenegildo (ICLP, 2008)

Artificial life programming in the robust-first attractor. - David H. Ackley; Elena S. Ackley (ECAL, 2015)

The ulam Programming Language for Artificial Life. - David H. Ackley; Elena S. Ackley (Artif. Life, 2016)