The Microbead: A Highly Miniaturized Wirelessly Powered Implantable Neural Stimulating System. - Adam Khalifa; Yasha Karimi; Qihong Wang; Sahithi Garikapati; Webert Montlouis; Milutin Stanacevic; Nitish V. Thakor; Ralph Etienne-Cummings (IEEE Trans. Biomed. Circuits Syst., 2018)