@article{TAC_1999_5_a1,
     author = {Sjoerd Crans},
     title = {A tensor product for {Gray-categories}},
     journal = {Theory and applications of categories},
     pages = {12--69},
     publisher = {mathdoc},
     volume = {5},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_1999_5_a1/}
}