@article{10_37236_263,
     author = {Torsten Sander},
     title = {Sudoku graphs are integral},
     journal = {The electronic journal of combinatorics},
     year = {2009},
     volume = {16},
     number = {1},
     doi = {10.37236/263},
     zbl = {1185.05100},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/263/}
}