Rüegg, J. C. Max Planck Institute for Medical Research, Max Planck Society;
http://science.sciencemag.org/content/147/3665/1581/tab-pdf (Any fulltext)
https://doi.org/10.1126/science.147.3665.1581 (Any fulltext)
Filo, R. S., Bohr, D. F., & Rüegg, J. C. (1965). Glycerinated skeletal and smooth muscle: calcium and magnesium dependence. Science, 147(3665), 1581-1583. doi:10.1126/science.147.3665.1581.