1. Book “Vacuum Technology – Third, Updated and Enlarged Edition”;Roth,1989
2. Monte Carlo calculation of molecular flow rates through in a cylindrical elbow and pipes of other shapes;Davis;J Appl Phys,1960
3. Optimization of molecular flow conductance;Levenson,1960
4. A review of the molecular flow conductance for systems of tubes and components and the measurement of pumping speed;Steckelmacher;Vacuum,1966
5. Gas flow patterns at entrance and exit of cylindrical tubes;Dayton,1957