Gabriele Fici Filippo Mignosi Antonio Restivo Marinella Sciortino Word assembly through minimal forbidden words. 214-230 2006 359 Theor. Comput. Sci. 1-3 http://dx.doi.org/10.1016/j.tcs.2006.03.006 db/journals/tcs/tcs359.html#FiciMRS06