Jeffrey Huw Williams, formerly at Bureau International des Poids et Mesures (BIPM)ISBN: 9781681746241 | PDF ISBN: 9781681746258Copyright © 2018 | 145 PagesDOI: 10.1088/978-1-6817-4625-8Many institutions worldwide provide digital library access to Morgan & Claypool titles. You can check for personal access by clicking on the DOI link.