Paola Bonizzoni Clelia de Felice Rosalba Zizza The structure of reflexive regular splicing languages via Sch6uuml;tzenberger constants. 71-98 2005 334 Theor. Comput. Sci. 1-3 http://dx.doi.org/10.1016/j.tcs.2004.12.033 db/journals/tcs/tcs334.html#BonizzoniFZ05