@article{TAC_2005_15_a4,
     author = {S. Awodey and H. Forssell},
     title = {Algebraic models of intuitionistic theories of sets and classes},
     journal = {Theory and applications of categories},
     pages = {147--163},
     year = {2005},
     volume = {15},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2005_15_a4/}
}