Pulse Pile-up Correction by Particle Swarm Optimization with Double-layer Parameter Identification Model in X-ray Spectroscopy. - Xiao-Feng Yang; Hongquan Huang; Guo-Qiang Zeng; Liang-Quan Ge; Kai-ming Jiang; Min Gu; Chuan-Hao Hu; Mao-Lin Lai (J. Signal Process. Syst., 2022)