Hasselbach, Wilhelm Emeritus Group Biophysics, Max Planck Institute for Medical Research, Max Planck Society;
http://onlinelibrary.wiley.com/doi/10.1111/j.1432-1033.1971.tb01480.x/epdf (Any fulltext)
https://doi.org/10.1111/j.1432-1033.1971.tb01480.x (Any fulltext)
Seiler, D., & Hasselbach, W. (1971). Essential fatty acid deficiency and the activity of the sarcoplasmic calcium pump. European Journal of Biochemistry, 21(3), 385-387. doi:10.1111/j.1432-1033.1971.tb01480.x.