@article{CCFH2005,
author = {J. Casillas and  O. Cord\'on and  I. Fernandez and  F. Herrera},
title = {Learning cooperative linguistic fuzzy rules using the best-worst ant system algorithm},
journal = {International Journal of Intelligent Systems},
volume = {20},
number = {4},
pages = {433--452},
year = {2005}
}