Prof. Ha’s paper on ENIAC stimulator is accepted to TBioCAS and is available on IEEExplore: link.

Sohmyung Ha, Chul Kim, Jiwoong Park, Gert Cauwenberghs and Patrick P. Mercier, “A Fully Integrated RF-powered Energy-replenishing Current-controlled Stimulator,” IEEE Transactions on Biomedical Circuits and Systems (TBioCAS), Vol.13, No.1, February 2013.