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==External links==
*[http://pdf.aiaa.org/getfile.cfm?urlX=75%26%5D0%3BU%2BDN%26S7S%20%27MWT%5BBQ%3A%2B94%5B8%20%5F%5F%3C%20%0A&urla=%25%2B2L%25%22PH%20%0A&urlb=%21%2A%20%20%20%0A&urlc=%21%2A0%20%20%0A&urld=%28%2A%22D%26%23%20JGUA4%20%0A&urle=%27%282P%24%21P6JU0%20%20%0A AIAA meeting paper study comparing Poodle thrusters to a chemical (hydrogen/fluorine) option for upper stage propulsion]{{dead link|date=January 2018 |bot=InternetArchiveBot |fix-attempted=yes }}
*United States Patent 3315471; Direct cycle radioisotope rocket engine; 1967; Lee, Dailey Charles, Verdes, Estates Palos
*United States Patent 3306045; Radioisotope rocket; 1967; Buford Jr., William H. Thomas Jr., Arthur N
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