@article{HHA_2013_15_2_a16,
     author = {C. Barwick and D. M. Kan},
     title = {$n$-relative categories: a model for the homotopy theory of $n$-fold homotopy theories},
     journal = {Homology, homotopy, and applications},
     pages = {281--300},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {2013},
     doi = {10.4310/HHA.2013.v15.n2.a17},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4310/HHA.2013.v15.n2.a17/}
}