Butkus, D., I. Laučytė, and R. Ladygienė. “Estimation of Effective Dose Caused by 40K, 90Sr and 137Cs in Daily Food”. Journal of Environmental Engineering and Landscape Management, vol. 14, no. 2, June 2006, pp. 77-81, doi:10.3846/16486897.2006.9636882.