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| | [No title] (Site not responding. Last check: 2007-10-23) |
 | | U.S. Patent (F. Zwicky) No. 2,821,838: Jet Propulsion Device Operation through Fluid Medium, and Method of Operating it, February 4, 1958. |
 | | US Patent No. 3,121,992 (F. Zwicky and Frederick J. Ewing). |
 | | Text dazu von Lessing (?): Jet Propulsion: The U. Is Behind. |
| www.zwicky-stiftung.ch /Publikationen/Liste.htm (6324 words) |
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