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APA Citation
Oswin, A., Fischer, A., Fischer, F., Meier, J. F., Pferschy, U., Pilz, A., & Staněk, R. (2017). minimization and maximization versions of the quadratic travelling salesman problem. Optimization, 66, 521–546. http://access.bl.uk/ark:/81055/vdc_100041672919.0x000062