Stephen G. Simpson. Nichtbeweisbarkeit von gewissen kombinatorischen Eigenschaften endlicher Bäume. Arch. Math. Log., 25(1):45-65, 1985. [doi]
@article{Simpson85,
title = {Nichtbeweisbarkeit von gewissen kombinatorischen Eigenschaften endlicher Bäume},
author = {Stephen G. Simpson},
year = {1985},
doi = {10.1007/BF02007556},
url = {http://dx.doi.org/10.1007/BF02007556},
researchr = {https://researchr.org/publication/Simpson85},
cites = {0},
citedby = {0},
journal = {Arch. Math. Log.},
volume = {25},
number = {1},
pages = {45-65},
}