@article{10_37236_5309,
     author = {Daniel W. Cranston and Landon Rabern},
     title = {Planar graphs have independence ratio at least 3/13},
     journal = {The electronic journal of combinatorics},
     year = {2016},
     volume = {23},
     number = {3},
     doi = {10.37236/5309},
     zbl = {1344.05051},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/5309/}
}