%0 Journal Article %A John C. Baez %A Alexander E. Hoffnung %A Christopher D. Walker %T Higher Dimensional Algebra VII: Groupoidification %J Theory and applications of categories %D 2010 %P 489-553 %V 24 %I mathdoc %U http://geodesic.mathdoc.fr/item/TAC_2010_24_a17/ %G en %F TAC_2010_24_a17