Marcella Anselmo Alessandra Cherubini Pierluigi San Pietro Regular Languages and Associative Language Descriptions. 2007 9 Discrete Mathematics & Theoretical Computer Science 2 http://www.dmtcs.org/dmtcs-ojs/index.php/dmtcs/article/view/663/1795 db/journals/dmtcs/dmtcs9.html#AnselmoCP07