Prof.Dr. Oleg BURDAKOV, Linköping University Department of Mathematics Linköping-Sweden. A winner of the International Implementation Challenge in Solving Steiner Tree Problems organized in 2014 by the US Center for Discrete Mathematics and Theoretical Computer Science (DIMACS) which is a collaboration between Rutgers University, Princeton University, and the research firms AT&T, Bell Labs, NEC, and Applied Communication Sciences. Visiting Scientist award under the Chinese Academy of Sciences President's International Fellowship Initiative for 2017.