Marshall RW and Robertson WG: Nomograms for the estimation of the saturation of urine with calcium oxalate, calcium phosphate, magnesium ammonium phosphate, uric acid, sodium acid urate, ammonium acid urate and cystine. Clin Chim Acta 15: 253-260, 1976
Finlayson B: Calcium stones: Some Physical and clinical aspects. In: Calcium Metabolism in Renal Failure and Nephrolithiasis (David DS, eds), pp 337-382, John Wiley & Sons Inc, New York, 1977