Fábio Viduani Martinez José Coelho de Pina José Soares Algorithms for terminal Steiner trees. 133-142 2007 389 Theor. Comput. Sci. 1-2 http://dx.doi.org/10.1016/j.tcs.2007.08.001 db/journals/tcs/tcs389.html#MartinezPS07