@article{MS2_1983__52_166844,
     author = {Alexander Kumjian},
     title = {Preliminary algebras arising from local homeomorphisms.},
     journal = {Mathematica Scandinavica},
     pages = {269--278},
     year = {1983},
     volume = {52},
     zbl = {0541.46047},
     url = {http://geodesic.mathdoc.fr/item/MS2_1983__52_166844/}
}