@article{GDZPPN002044773,
title = {A simple tree and its application to a counterexample of Philips.},
journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
volume = {18},
year = {1977},
pages = {67-72},
zbl = {0402.03024},
url = {http://dml.mathdoc.fr/item/GDZPPN002044773}
}
Potthoff, Klaus. A simple tree and its application to a counterexample of Philips.. Archiv für mathematische Logik und Grundlagenforschung, Tome 18 (1977) pp. 67-72. http://gdmltest.u-ga.fr/item/GDZPPN002044773/