Links
[1] https://bonn.leibniz-lib.de/en/research/research-centres-and-groups
[2] https://bonn.leibniz-lib.de/en/research/networks
[3] https://bonn.leibniz-lib.de/en/research/education-and-promotion
[4] https://bonn.leibniz-lib.de/en/research/collections
[5] https://bonn.leibniz-lib.de/en/research/projects
[6] https://bonn.leibniz-lib.de/en/research/projects/joint-danube-survey
[7] https://bonn.leibniz-lib.de/en/research/publications
[8] https://bonn.leibniz-lib.de/en/research/library
[9] https://bonn.leibniz-lib.de/en/research/conferences-and-symposia
[10] https://bonn.leibniz-lib.de/en/research
[11] https://bonn.leibniz-lib.de/en/print/15041
[12] https://bonn.leibniz-lib.de/en/printmail/node/15041
[13] https://bonn.leibniz-lib.de/en/zfmk/jonas-astrin
[14] https://bonn.leibniz-lib.de/en/taxonomy/term/63
[15] http://www.danubesurvey.org/
[16] http://www.icpdr.org/main/
[17] https://www.uni-due.de/aquatische_oekosystemforschung/
[18] http://www.danubesurvey.org/jds4/
[19] http://www.danubesurvey.org/jds4/jds4-files/nodes/documents/icdpr_jds4_flyer2019_reprint_web.pdf