Yue, X., Kiely, J., Gibson, D., & Drakakis, E. M. (2020). Charge-based supercapacitor storage estimation for indoor sub-mW photovoltaic energy harvesting powered wireless sensor nodes. IEEE Transactions on Industrial Electronics, 67(3), 2411-2421. https://doi.org/10.1109/TIE.2019.2896321