Elias, E.A. 2016. EQUATIONS FOR GAMMA-RAY ATTENUATION SYSTEMS WITH BEAM DIRECTED VERTICALLY, ALONG GRAVITIONAL FIELD. BRAZILIAN JOURNAL OF AGRICULTURE - Revista de Agricultura. 79, 2 (mar. 2016), 169–176. DOI:https://doi.org/10.37856/bja.v79i2.2825.