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2. A summary guide on plugging materials;Danjushevski,1973
3. Lightweight plugging cement slurries;Lucenko,1972
4. N. Djabarov, Expansive additive for cements, cement mortars and concretes, Bulgarian patent #72240, 1985.
5. The influence of fly-ash cenospheres on the details of cracking in fly-ash bearing cement pastes;Montgomery;Cem Concr Res,1984