Graßhoff, Gerd Max Planck Fellow Computational History of Science, Max Planck Institute for the History of Science, Max Planck Society;
http://repository.edition-topoi.org/collection/PIND (beliebiger Volltext)
Graßhoff, G., Wäfler, M., Hofmeier, T., & Fischer, G. (2016). Rock paintings in Indonesia (Database). doi:10.17171/1-7.