Combined backscatter and transmission method for nuclear density gaugeSeyed Mohammad Golgoun, Dariush Sardari, Mahdi Sadeghi, Mohammad Ebrahimi, Mojtaba Aminipour and Mohammad Reza DavarpanahEPJ Web of Conferences, 100 (2015) 02004DOI: https://doi.org/10.1051/epjconf/201510002004