@article{IM_1974__23_142253,
     author = {Walter Baur},
     title = {\"Uber rekursive {Strukturen.}},
     journal = {Inventiones mathematicae},
     pages = {89--96},
     publisher = {mathdoc},
     volume = {23},
     year = {1974},
     zbl = {0285.02050},
     url = {http://geodesic.mathdoc.fr/item/IM_1974__23_142253/}
}