@article{CLTM_1964_1964_1_a4,
     author = {Weber, Werner},
     title = {Ein {Problem} rekursiver {Entscheidungen.}},
     journal = {Collectanea mathematica},
     year = {1964},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/CLTM_1964_1964_1_a4/}
}