@article{TAC_2004_12_a11,
     author = {Michel Hebert},
     title = {K-purity and orthogonality},
     journal = {Theory and applications of categories},
     pages = {355--371},
     year = {2004},
     volume = {12},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2004_12_a11/}
}