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Asadian, Mohammad H.; Askari, Sina; Shkel, Andrei M. (2017). "An Ultrahigh Vacuum Packaging Process Demonstrating over 2 Million Q-Factor in MEMS Vibratory Gyroscopes". IEEE Sensors Letters. 1 (6): 1–4. Bibcode:2017ISenL...1L2287A. doi:10.1109/LSENS.2017.2762287.
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Danielson, Phil (2004). "How To Use Getters and Getter Pumps"(PDF). A Journal of Practical and Useful Vacuum Technology. The Vacuum Lab website. Archived from the original(PDF) on 2005-02-09. Retrieved November 27, 2014.