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J. Zikovsky; S. A. Dogel; A. J. Dickie; J. L. Pitters; R. A. Wolkow (2009). "Reaction of a hydrogen-terminated Si(100) surface in UHV with ion-pump generated radicals". Journal of Vacuum Science and Technology A. 27 (2): 248. doi:10.1116/1.3071944.
Hall, L. D. (8 August 1958). "Ionic Vacuum Pumps: Instead of removing the particles of gas, some new pumps simply transfer them to the solid phase". Science. 128 (3319). American Association for the Advancement of Science (AAAS): 279–285. doi:10.1126/science.128.3319.279. ISSN0036-8075.
Penning, F.M. (1937). "Ein neues manometer für niedrige gasdrucke, insbesondere zwischen 10−3 und 10−5 mm". Physica (in German). 4 (2). Elsevier BV: 71–75. doi:10.1016/s0031-8914(37)80123-8. ISSN0031-8914.