@article{TAC_2007_18_a13,
     author = {Panagis Karazeris and Jiri Velebil},
     title = {Dense morphisms of monads},
     journal = {Theory and applications of categories},
     pages = {372--399},
     year = {2007},
     volume = {18},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2007_18_a13/}
}