@article{10_4007_annals_2013_177_1_3,
     author = {Bernhard Keller},
     title = {The periodicity conjecture for pairs of {Dynkin} diagrams},
     journal = {Annals of mathematics},
     pages = {111--170},
     publisher = {mathdoc},
     volume = {177},
     number = {1},
     year = {2013},
     doi = {10.4007/annals.2013.177.1.3},
     mrnumber = {2999039},
     zbl = {06146418},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4007/annals.2013.177.1.3/}
}