Language Equations with Complementation. - Alexander Okhotin; Oksana Yakimova (Developments in Language Theory, 2006)

Language equations with complementation: Decision problems. - Alexander Okhotin; Oksana Yakimova (Theor. Comput. Sci., 2007)

Language equations with complementation: Expressive power. - Alexander Okhotin; Oksana Yakimova (Theor. Comput. Sci., 2012)