@article{10_4171_dm_131,
     author = {Bernhard Keller and Amnon Neeman},
     title = {The connection between {May's} axioms for a triangulated tensor product and {Happel's} description of the derived category of the quiver $D_4$},
     journal = {Documenta mathematica},
     pages = {535--560},
     year = {2002},
     volume = {7},
     doi = {10.4171/dm/131},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/131/}
}