Florin Manea Victor Mitrana José M. Sempere Some Remarks on Superposition Based on Watson-Crick-Like Complementarity. 372-383 2009 Developments in Language Theory http://dx.doi.org/10.1007/978-3-642-02737-6_30 conf/dlt/2009 db/conf/dlt/dlt2009.html#ManeaMS09