Rezagholi, Mahmoud, and Apostolos Bantekas. “Optimizing the Fraction of Expensive Direct Measurements in an Exposure Assessment Study”. International Journal of Statistics in Medical Research 3, no. 1 (January 31, 2014): 44–54. Accessed March 9, 2025. http://lifescienceglobalca.com/index.php/ijsmr/article/view/1630.