References:

1. H.S Ray: R Sridhar and K.P.Abraham:
2. Rosenquist: Principles of extractive metallurgy
3. Butts: Metallurgical problem
4 .Coudrier; l, HupkinsD.W and I-Wilkomirnky : Fundamentals of metallurgical processes.
5. Y.K Rao: Strichiometrical calculation in mettalurgical; processes.