@article{GDZPPN002343886,
title = {W. ACKERMANN: Solvable cases of the decision problem},
journal = {Mathematica Scandinavica},
volume = {3},
year = {1955},
pages = {174-176},
url = {http://dml.mathdoc.fr/item/GDZPPN002343886}
}
SKOLEM, TH. W. ACKERMANN: Solvable cases of the decision problem. Mathematica Scandinavica, Tome 3 (1955) pp. 174-176. http://gdmltest.u-ga.fr/item/GDZPPN002343886/