1. A Connectionist Machine for Genetic Hillclimbing
2. Handbook of Test Problems in Local and Global Optimization
3. A. Hedar Test function web pages http://www-optima.amp.i.kyoto-u.ac.jp/member/student/hedar/Hedar_files/TestGO_files/Page364.htm
4. M. Molga C. Smutnicki Test functions for optimization needs http://www.zsd.ict.pwr.wroc.pl/files/docs/functions.pdf
5. Firefly Algorithm, Lévy Flights and Global Optimization