@book{Keller+1984,
url = {https://doi.org/10.1515/9783112498866},
title = {Das Zählen als angeborene Verhaltensweise},
author = {Ott-Heinrich Keller},
publisher = {De Gruyter},
address = {Berlin, Boston},
doi = {doi:10.1515/9783112498866},
isbn = {9783112498866},
year = {1984},
lastchecked = {2026-05-02}
}