!!Johannes Geiss
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[Obituary|https://www.heidi.news/sciences/johannes-geiss-pere-du-drapeau-suisse-deploye-en-juillet-1969-sur-la-lune-est-decede], by Olivier Dessibourg (in French)\\
[Obituary|https://www.nzz.ch/wissenschaft/johannes-geiss-der-physiker-mit-dem-sonnenwindsegel-ist-tot-ld.1538396], Neue Zürcher Zeitung (in German)
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[Johannes Geiss 90th Birthday|http://www.mps.mpg.de/4641106/geiss-geburtstag-04-sept-2016], Max Planck Institute for Solar System Research
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