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Siegrist, D; Hess, B; Montandon, M; Takkinen, R; Lippuner, K; Jaeger, P (1993). [Urinary specific gravity--comparative measurements using reagent strips and refractometer in 340 morning urine samples]. Praxis - schweizerische Rundschau für Medizin, 82(4), pp. 112-6. Bern: Huber
