Amihood Amir Eran Chencinski Costas S. Iliopoulos Tsvi Kopelowitz Hui Zhang 298-310 2008 395 Theor. Comput. Sci. 2-3 http://dx.doi.org/10.1016/j.tcs.2008.01.006 db/journals/tcs/tcs395.html#AmirCIKZ08