1. Abraham PA, Smith CL (1987) Evaluation of factors involved in calcium stone formation. Miner Electrolyte Metab 13:201
2. Costello J, Hatch M, Bourke E (1976) An enzymic method for the spectrophotometric measurement of oxalic acid. J Lab Clin Med 87:903
3. Costello J, Landwehr DM (1988) Determination of oxalate concentration in blood. Clin Chem 34:1540
4. Drach GW, Perin R, Jacobs S (1979) Outpatient evaluation of patients with calcium urolithiasis. J Urol 121:564
5. Greger R, Lang F, Oberleithner H, Sporer H (1980) Renal handling of oxalate. Renal Physiol 2:57