1. Robertson, W. G., Peacock, M., Ouimet, D., Heyburn, P. J., Rutherford, A.: The main risk factor for calcium oxalate stone disease in man: hypercalciuria or mild hyperoxaluria? In: Urolithiasis, Clinical and Basic Research, p. 3, eds. Smith, L. H., Robertson, W. G., Finlayson, B., Plenum Press (New York, London 1980).
2. Robertson, W. G., Peacock, M.: The cause of idiopathic calcium stone disease: hypercalciuria or hyperoxaluria? Nephron 26; 105–110 (1982).
3. Schwille, P. O., Paulus, M., Scholz, D., Sigel, A.: Urin-Oxalat bei rezidivierender Calcium-Urolithiasis ohne und mit Überfunktion der Nebenschilddrüsen und bei Gesunden. Urologe A 18; l–10 (1979).
4. Roberston, W. G., Peacock, M., Heyburn, P. J., Marshall, R. W., Williams, R. E., Clark, P. B.: The significance of mild hyperoxaluria in calcium stone formation. In: Oxalate in Human Biochemistry and Clinical Pathology, p. 173; eds. Rose, A. G., Robertson, W. G., Watts, R. W. E., Wellcome, London.
5. Hodgkinson, A.: Relations between oxalic acid, calcium, magnesium and creatinine excretion in normal men and male patients with calcium oxalate kidney stones. Clin. Sci. Mol. Med. 46; 357–367 (1974).