Robert Ganian, M.S. Ramanujan, Stefan Szeider. Backdoors to Tractable Valued CSP. Principles and Practice of Constraint Programming - 22nd International Conference, CP 2016, Toulouse, France, September 5-9, 2016, Proceedings (Michel Rueher), volume 9892 of Lecture Notes in Computer Science, pages 233-250, 2016, Springer Verlag.