Müller, M., L. Kolly, M. Bauman, S. Imboden, and D. Surbek. “Analysis of Caesarean Section Rates over Time in a single Swiss Centre Using a Ten-Group Classification System”. Swiss Medical Weekly, vol. 144, no. 0708, Feb. 2014, p. w13921, doi:10.4414/smw.2014.13921.