Kreutle, V., C. Blum, C. Meier, M. Past, B. Müller, P. Schütz, and K. Borm. “Bisphosphonate Induced Hypocalcaemia – report of Six Cases and Review of the Literature”. Swiss Medical Weekly, vol. 144, no. 2526, June 2014, p. w13979, doi:10.4414/smw.2014.13979.