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3. W. Rubin and B.M. Allen, The chemistry and behaviour of fluxes, Trans. /nst. Met. Finish. 50, 133–137 (1972).
4. B.M. Allen, Soldering Handbook, Iliffe, United Kingdom (1969).
5. D.R. Andrews, ed., Soldering, Brazing, Welding and Adhesives, ( Institute of Production Engineers, London, 1978 ).