1. Long term survey of 538 patients with upper urinary tract stone disease;Williams;Br J Urol,1963
2. Experience with longterm use of sodium cellulose phosphate for prevention of renal calcium stones;Ljunghall,1981
3. Prevention of kidney stones;Coe;Am J Med,1981
4. Risk factors in calcium stone disease of the urinary tract;Robertson;Br J Urol,1978
5. Allopurinol for calcium oxalate stones?;Editorial;Lancet,1987