@article{MAN_1970__185_161947,
     author = {R. KERKHOFF},
     title = {Gleichungsdefinierbare {Klassen} partieller {Algebren.}},
     journal = {Mathematische Annalen},
     pages = {112--133},
     publisher = {mathdoc},
     volume = {185},
     year = {1970},
     url = {http://geodesic.mathdoc.fr/item/MAN_1970__185_161947/}
}