M. E. DOLAR, S. AYAZ, Çağlar BAYSAL, U. YILMAZ, A. S. BOYACIOĞLU, and M. E. CANER, “SERUM RETINOL-BINDING PROTEIN LEVEL IN CHRONIC LIVER DISEASE”, Turkish Journal of Gastroenterology, vol. 3, no. 4, pp. 617–620, Jan. 1992.