@article{10_37236_6231,
     author = {Ben Lund},
     title = {An improved bound on {\((A+A)/(A+A)\)}},
     journal = {The electronic journal of combinatorics},
     year = {2016},
     volume = {23},
     number = {3},
     doi = {10.37236/6231},
     zbl = {1351.05009},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/6231/}
}