Hasselbach, Wilhelm Emeritus Group Biophysics, Max Planck Institute for Medical Research, Max Planck Society;
https://www.degruyter.com/downloadpdf/j/znc.1978.33.issue-7-8/znc-1978-7-819/znc-1978-7-819.xml (Any fulltext)
https://doi.org/10.1515/znc-1978-7-819 (Any fulltext)
Sommer, J. R., Wallace, N. R., & Hasselbach, W. (1978). The collapse of the sarcoplasmic reticulum in skeletal muscle. Zeitschrift für Naturforschung, C: Journal of Biosciences, 33(7-8), 561-573. doi:10.1515/znc-1978-7-819.