Xiao-Sheng Si Wenbin Wang 0002 Chang-Hua Hu Dong-Hua Zhou Michael G. Pecht Remaining Useful Life Estimation Based on a Nonlinear Diffusion Degradation Process. 50-67 2012 61 IEEE Trans. Reliab. 1 https://doi.org/10.1109/TR.2011.2182221 db/journals/tr/tr61.html#SiWHZP12