@article{10_4064_cm_23_2_181_190,
     author = {G. C. Wraith},
     title = {Algebras over theories},
     journal = {Colloquium Mathematicum},
     pages = {181--190},
     publisher = {mathdoc},
     volume = {23},
     number = {2},
     year = {1971},
     doi = {10.4064/cm-23-2-181-190},
     language = {de},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-23-2-181-190/}
}