@article{AM2_1981__23_136889,
     author = {Walter Taylor},
     title = {Hyperidentities and hypervarieties.},
     journal = {Aequationes mathematicae},
     pages = {30--49},
     publisher = {mathdoc},
     volume = {23},
     year = {1981},
     zbl = {0491.08009},
     url = {http://geodesic.mathdoc.fr/item/AM2_1981__23_136889/}
}