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2. 2) A. Roth : “Vacuum Technology” (Noth-Holland Physics Publishing, Amsterdam, 1982).
3. 3) J.M. Lafferty : “Foundations of Vacuum Science and Technology” (Johon Wiley and Sons, Inc., New York, 1998).
4. 4) C.N. Jackson, Jr., C.N. Sherlock and P.O. Moore : “Nondestructive testing handbook” Third Edition, Volume 1, Leak testing (American Society for Nondestructive Testing, 1998).
5. 5) K. Jousten (Ed.) : “Handbook of Vacuum Technology” (Wiley-VCH Verlag GmbH and Co., Weinheim, 2008).