@article{10_4064_am_21_4_571_573,
     author = {P F. K\"orner},
     title = {A note on optimality conditions for dual problems to the traveling salesman problem},
     journal = {Applicationes Mathematicae},
     pages = {571--573},
     publisher = {mathdoc},
     volume = {21},
     number = {4},
     year = {1991},
     doi = {10.4064/am-21-4-571-573},
     zbl = {0771.05060},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-21-4-571-573/}
}