1. Manon Van De Velden, Jan Baeyens, Kathleen Smolders, Chem. Eng. Sci., 62 (2007) 2139.
2. G. S. Patience, J. Chaouki, Solid circulation rate determined by pressure drop method, in: CFB Technology III, P. Basu, M. Horio, M. Hastatani (Eds), Pergamon Press, Oxford, 1991, p. 627.
3. J. J. Burkell, J. R. Grace, J. Zhao, C. J. Lim, Measurement of solid circulation rates in circulating fluidised beds, in Circulating Fluidised Bed Technology II.
4. J. S. Charlton, Radioisotope Tracer Techniques for Problem Solving in Industrial Plants, Leonard Hill, Glasgow and London, 1986, p. 320.
5. International Atomic Energy Agency, Technical Report Series No. 316, Guidebook on Radioisotope Tracers in Industry, IAEA, Vienna, 1990, p. 374.