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Spencer, H; Fuller, H; Norris, C; Williams, D . (1994). Effect of magnesium on the intestinal absorption of calcium in man.. Journal of the American College of Nutrition, 13(5), 485–492. doi:10.1080/07315724.1994.10718439 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research