Kuijpers, Maikel Department Artifacts, Action, Knowledge, Max Planck Institute for the History of Science, Max Planck Society;
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0240462 (Any fulltext)
journal.pone.0240462.pdf (Publisher version), 2MB
Kuijpers, M., & Popa, C. N. (2021). The Origins of Money: Calculation of Similarity Indexes Demonstrates the Earliest Development of Commodity Money in Prehistoric Central Europe. PLoS ONE, 16(1, Article e0240462): e0240462. doi:10.1371/journal.pone.0240462.