Yo-Sub Han Arto Salomaa Kai Salomaa Derick Wood Sheng Yu On the existence of prime decompositions. 60-69 2007 376 Theor. Comput. Sci. 1-2 http://dx.doi.org/10.1016/j.tcs.2007.01.013 db/journals/tcs/tcs376.html#HanSSWY07