Jonghoon Kim Jaemoon Lee Bo-Hyung Cho Equivalent Circuit Modeling of PEM Fuel Cell Degradation Combined With a LFRC. 5086-5094 2013 60 IEEE Trans. Ind. Electron. 11 https://doi.org/10.1109/TIE.2012.2226414 db/journals/tie/tie60.html#KimLC13