@article{MS2_1980__47_166715,
     author = {Jesper Michael Moller},
     title = {On polynomial coverings and their classification.},
     journal = {Mathematica Scandinavica},
     pages = {116--122},
     publisher = {mathdoc},
     volume = {47},
     year = {1980},
     zbl = {0462.57001},
     url = {http://geodesic.mathdoc.fr/item/MS2_1980__47_166715/}
}