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Crescenzi, P., Kann, V., Silvestri, R., Trevisan, L. (1995). Structure in approximation classes. In: Du, DZ., Li, M. (eds) Computing and Combinatorics. COCOON 1995. Lecture Notes in Computer Science, vol 959. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0030875
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