P. Isyan, A. W. Harto, and Y. Sardjono, “Conceptual Design of Collimator at Boron Neutron Capture Therapy Facility with 30 MeV Cyclotron and Target 9Be as Neutron Generator Using Monte Carlo N-Particle Extended Simulator”, ijpna, vol. 2, no. 1, pp. 47–53, Feb. 2017.