SpO2 Sensor Embedded in a Finger Ring: design and implementation. - Josep Solà; Serge Castoldi; Olivier Chételat; Marc Correvon; Stephan Dasen; Serge Droz; Nathalie Jacob; Roger Kormann; Victor Neumann; André Perrenoud; Pascal Pilloud; Christophe Verjus; et al. (EMBC, 2006)