Hasselbach, Wilhelm Emeritus Group Biophysics, Max Planck Institute for Medical Research, Max Planck Society;
http://onlinelibrary.wiley.com/doi/10.1111/j.1749-6632.1966.tb50216.x/epdf (Any fulltext)
https://doi.org/10.1111/j.1749-6632.1966.tb50216.x (Any fulltext)
Hasselbach, W. (1966). Structural and enzymatic properties of the calcium transporting membranes of the sarcoplasmic reticulum. Annals of the New York Academy of Sciences, 137, 1041-1048. doi:10.1111/j.1749-6632.1966.tb50216.x.