@article{TAC_1998_4_a1,
     author = {D. Bourn and G. Janelidze},
     title = {Protomodularity, descent, and semidirect products},
     journal = {Theory and applications of categories},
     pages = {37--46},
     publisher = {mathdoc},
     volume = {4},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_1998_4_a1/}
}