@article{TAC_2012_26_a12,
     author = {J. Lambek and Michael Barr and John F. Kennison and R. Raphael},
     title = {Injective hulls of partially ordered monoids},
     journal = {Theory and applications of categories},
     pages = {338--348},
     publisher = {mathdoc},
     volume = {26},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2012_26_a12/}
}