@article{TAC_2001_9_a8,
     author = {Luigi Santocanale},
     title = {The alternation hierarchy for the theory of $\mu$-lattices},
     journal = {Theory and applications of categories},
     pages = {166--197},
     publisher = {mathdoc},
     volume = {9},
     year = {2001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2001_9_a8/}
}