Removing Undesirable Flows by Edge Deletion
G. Polevoy, S. Trajanovski, P. Grosso, C. de Laat, in: D. Kim, R.N. Uma, A. Zelikovsky (Eds.), Combinatorial Optimization and Applications, Springer International Publishing, Cham, 2018, pp. 217–232.

Filtering Undesirable Flows in Networks
G. Polevoy, S. Trajanovski, P. Grosso, C. de Laat, in: Combinatorial Optimization and Applications: 11th International Conference, COCOA 2017, Shanghai, China, December 16-18, 2017, Proceedings, Part I, Springer International Publishing, Cham, 2017, pp. 3–17.

Hardness of approximation for quantum problems
S. Gharibian, J. Kempe, Quantum Information &; Computation 14 (2014) 517–540.