@article{TAC_2015_30_a42,
     author = {Jeffrey C. Morton and Roger Picken},
     title = {Transformation double categories associated to 2-group actions},
     journal = {Theory and applications of categories},
     pages = {1429--1468},
     publisher = {mathdoc},
     volume = {30},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2015_30_a42/}
}