_:vb1970916 . _:vb1970916 "{\"id\": \"cc-by/4.0\", \"name\": \"Creative Commons Namensnennung \u2013 4.0 International (CC BY 4.0)\", \"url\": \"http://creativecommons.org/licenses/by/4.0/\", \"quelle\": \"Infrasound_hf_product \u00A9 BGR, Hannover, 2021, doi:10.25928/bgrseis_bbhf-ifsd\"}"@de .