1. Achilles W and Ulshüfer B (1985) Calculations of complex-chemical equilibria in urine: estimate of stone formation risks and derivation of prophylactic measures. In: Schwüle PO, Robertson WG, Smith LH, Vahlensieck W (eds) Urolithiasis and Related Clinical Research Plenum Press New York pp 777–780
2. Nancollas WG (1965) Interactions in Electrolyte Solutions. Elsevier, Amsterdam
3. Robertson WG (1969) Measurement of ionized calcium in biological fluids. Clin Chim Acta 24: 149–157
4. Daniele PG and Marangella M (1982) Ionic equilibria in urine, a computer model system improved by accurate stability constant values. Ann Chim 72: 25–38
5. Achilles W (1985) Methodische Neuerungen des kinetischen Gelkristallisationsverfahrens (GKV): Automatisierte Messung des Kalziumoxalat-Kristallwachstums durch Scanning-Mikroskopphotometrie. In diesem Band S. 252