These studies represented each pattern category by a single density.
Neila Mezghani, Amar Mitiche, Mohamed Cheriet 2012, 'Maximum Entropy Gibbs Density Modeling for Pattern Classification', Entropyhttp://www.mdpi.com/1099-4300/14/12/2478. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)