Rüegg, J. C. Max Planck Institute for Medical Research, Max Planck Society;
https://doi.org/10.1098/rspb.1964.0069 (Any fulltext)
Rüegg, J. C. (1964). Tropomyosin-paramyosin system and 'prolonged contraction' in a molluscan smooth muscle. Proceedings of the Royal Society B, 160(981), 536-542. doi:10.1098/rspb.1964.0069.