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F. Lamas; C. Irigaray; C. Oteo; J. Chacón. (2005). Selection of the most appropriate method to determine the carbonate content for engineering purposes with particular regard to marls. , 81(1), 32–41. doi:10.1016/j.enggeo.2005.07.005 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research