1. Fuzzy Models For Pattern Recognition;Bezdek,1992
2. Avian flight formations;Heppner;Bird-Banding,1974
3. A stochastic nonlinear model for coordinated bird flocks;Heppner,1987
4. Three-dimensional structure and dynamics of bird flocks;Heppner,1997
5. A stochastic nonlinear model for coordinated bird flocks;Heppner,1990