@misc{williams_2018_1232251, author = {Williams, E. R.}, title = {{Toward the SI System Based on Fundamental Constants: Weighing the Electron}}, month = apr, year = 2018, publisher = {Zenodo}, doi = {10.1109/tim.2007.890591}, url = {https://doi.org/10.1109/tim.2007.890591} }