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et al., "Complexometric determination of calcium and magnesium in urine." Voprosy Meditsinskoi Khimii 13.1 (1967): 86-88.
Siudmak, N. V. (1967). Complexometric determination of calcium and magnesium in urine. Voprosy Meditsinskoi Khimii, 13(1), 86-88.