Recent progress on the BIPM watt balance Hao Fang, Adrien Kiss, Lennart Robertsson, Estefania de Mirandés, Stéphane Solve, Thomas Lavergne, Alain Picard and Michael Stock EPJ Web of Conferences, 77 (2014) 00023 Published online: 19 August 2014 DOI: 10.1051/epjconf/20147700023