Judit Csima (2002). Investigations on Simple Eco-Grammar Systems (Ph.D. thesis). Eötvös Loránd University. http://www.cs.bme.hu/~csima/phd1/phd1.html
Jirků, Petr; Kelemen, Jozef (1996). Chapters in Cognitive Science (in Czech). University of Economics, Prague. ISBN 80-7079-787-8. 80-7079-787-8
Judit Csima (2002). Investigations on Simple Eco-Grammar Systems (Ph.D. thesis). Eötvös Loránd University. http://www.cs.bme.hu/~csima/phd1/phd1.html
Judit Csima (2002). Investigations on Simple Eco-Grammar Systems (Ph.D. thesis). Eötvös Loránd University. http://www.cs.bme.hu/~csima/phd1/phd1.html
Judit Csima (2002). Investigations on Simple Eco-Grammar Systems (Ph.D. thesis). Eötvös Loránd University. http://www.cs.bme.hu/~csima/phd1/phd1.html