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2. R.L. Sharma, The effect of mineral additions on the performance of ordinary Portland cement, a PhD thesis submitted to Dr. B.R. Ambedkar, University Agra, India, 1998.
3. Environmental challenges;Lawrie;World Cem.,1998
4. Limestone addition to Portland cement;Tong,1993
5. Cement with calcium carbonate additions;Ramachandran,1986