1. Sierakowski R, Finlayson B, Landes RR, Finlayson CD, Sierakowski N (1978) The frequency of urolithiasis in hospital discharge diagnoses in the United States. Invest Urol 15:438–441
2. Drach GW (1992) Urinary lithiasis etiology, diagnosis, and medical management. In: Campbell MF, Harrison JH (eds) Campbell’s textbook of urology, Sanders: Philadelphia, pp 2085–2156
3. Iwata H, Iio S, Nishio S, Takeuchi M (1992) Architecture of mixed calcium oxalate dihydrate and monohydrate stones. Scanning Microsc 6:231–238
4. Tazzoli V, Domeneghetti C (1980) The crystal structures of whewellite and weddellite: re-examination and comparison. Am Mineral 65:327–334
5. Deganello S (1981) The structure of whewellite, CaC2O4·H2O at 328 K. Acta Crystallogr B37:826–829