@article{BalasStephan2009, author = {Balas, Egon and Stephan, R{\"u}diger}, title = {On the cycle polytope of a directed graph and its relaxations}, volume = {54}, journal = {Networks}, number = {1}, doi = {10.1002/net.20303}, pages = {47 -- 55}, year = {2009}, language = {en} }