@article{MAN_1970__184_161916,
     author = {Y.Ch. WONG},
     title = {A {Short} {Proof} of {Schaefer's} {Theorem.}},
     journal = {Mathematische Annalen},
     pages = {155--156},
     publisher = {mathdoc},
     volume = {184},
     year = {1970},
     zbl = {0176.10502},
     url = {http://geodesic.mathdoc.fr/item/MAN_1970__184_161916/}
}