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Quantitative determination of calcium, phosphorus, and oxalic acid, assisted by occasional determination of ammonia nitrogen and insoluble nitrogen when indicated by qualitative tests, provides a means of computing the component substances of calculi. The determinations may be performed by slight modifications of the methods in use in the routine clinical chemistry laboratory, although flame photometry is particularly convenient for the determination of calcium.
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Leonard et al. (1955) studied this question.
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