@article{TAC_2012_26_a7,
     author = {Michael A. Warren},
     title = {A characterization of representable intervals},
     journal = {Theory and applications of categories},
     pages = {204--232},
     publisher = {mathdoc},
     volume = {26},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2012_26_a7/}
}