Orthogonal-least-squares and backpropa- gation hybrid learning algorithm for interval A2-C1 singleton type-2 Takagi-Sugeno-Kang fuzzy logic systems. - Gerardo M. Mendez; J. Cruz Martinez; David S. González; F. Javier Rendón-Espinoza (Int. J. Hybrid Intell. Syst., 2014)