A new algorithm for regularizing one-letter context-free grammars. - Stefan Andrei; Salvador Valerio Cavadini; Wei-Ngan Chin (Theor. Comput. Sci., 2003)

Self-embedded context-free grammars with regular counterparts. - Stefan Andrei; Wei-Ngan Chin; Salvador Valerio Cavadini (Acta Informatica, 2004)