1. BIPM/IEC/IFCC/ISO/IUPAC/IUPAP/OIML, Guide to the Expression of Uncertainty in Measurement, 1st ed., ISO, Geneva, Switzerland, 1993.
2. ISA, Terminology, dimensions and safety practices for indicating variable area meters (Rotameters):RP16.1 Glass tube, RP16.2 Metal tube, RP16.3 Extension type glass tube. Instrument Society of America, Report (recommended practice) RP 16.1.2.3, 1959.
3. KDG Mobrey Ltd, ROTAMETER Variable-area Flowmeters—Alternative uses, (1984) published by Meggitt Controls (now Solartron Mobrey Ltd—KDG Instrument Division).
4. Flow Measurement Handbook;Baker,2000
5. Variable area flow meters;Coleman;Trans. Instn. Chem. Engrs.,1956