K. Huysal, Y. Üstündağ, H. A. Çağlak, and M. R. Yeşil, “Reducing the Need for Repeat Urine Drug Testing with the Gray Zone Determined by the Measurement Uncertainty: Gray Zone for Urine Drug Testing”, J Med Biochem, vol. 42, no. 4, pp. 616–620, Apr. 2023, doi: 10.5937/jomb0-41777.