(plural Penning traps)
Named after Frans Michel Penning (1894–1953), Dutch physicist.
"penning-trap." YourDictionary, n.d. Web. 17 September 2018. <http://www.yourdictionary.com/penning-trap>.
penning-trap. (n.d.). Retrieved September 17th, 2018, from http://www.yourdictionary.com/penning-trap
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