@article{10_2140_agt_2017_17_111,
     author = {Livingston, Charles},
     title = {Notes on the knot concordance invariant {Upsilon}},
     journal = {Algebraic and Geometric Topology},
     pages = {111--130},
     year = {2017},
     volume = {17},
     number = {1},
     doi = {10.2140/agt.2017.17.111},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2017.17.111/}
}