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2. A compact, null reading, tilting U-tube micromanometer with a rigid liquid container;Bradshaw;J. Scient. Instrum.,1965
3. The effect of buoyancy on flow and heat transfer for a gas passing down a vertical pipe at low turbulent Reynolds numbers;Easby;CEGB Report No. RD-B/N3507,1976
4. The friction factor for clean round tubes;Drew;Trans. Am. Inst. Chem. Engrs,1932
5. Viscosity of gases in metric units;Watson,1972