@article{MAN_1969__180_161789,
     author = {W. Felscher},
     title = {Birkhoffsche und kategorische {Algebra.}},
     journal = {Mathematische Annalen},
     pages = {1--25},
     publisher = {mathdoc},
     volume = {180},
     year = {1969},
     zbl = {0157.04201},
     url = {http://geodesic.mathdoc.fr/item/MAN_1969__180_161789/}
}