@article{10_37236_1223,
     author = {R. L. Graham and B. D. Lubachevsky},
     title = {Dense packings of equal disks in an equilateral triangle: {From} 22 to 34 and beyond},
     journal = {The electronic journal of combinatorics},
     year = {1995},
     volume = {2},
     doi = {10.37236/1223},
     zbl = {0817.52020},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1223/}
}