Hasselbach, Wilhelm Emeritus Group Biophysics, Max Planck Institute for Medical Research, Max Planck Society;
https://www.sciencedirect.com/science/article/pii/0304415778900072/pdf?md5=4d81ef40f61a5f92b85a31f7aa35ca94&pid=1-s2.0-0304415778900072-main.pdf (Any fulltext)
https://doi.org/10.1016/0304-4157(78)90007-2 (Any fulltext)
Hasselbach, W. (1978). The reversibility of the sarcoplasmic calcium pump. Biochimica et Biophysica Acta: BBA, 515(1), 23-53. doi:10.1016/0304-4157(78)90007-2.