Schulz, Georg E. Emeritus Group Biophysics, Max Planck Institute for Medical Research, Max Planck Society;
https://link.springer.com/content/pdf/10.1007%2F978-3-642-69024-2_51.pdf (Any fulltext)
https://doi.org/10.1007/978-3-642-69024-2_51 (Any fulltext)
Schulz, G. E. (1983). Quantitative comparison of protein chain folds. In U. Berger (Ed.), Numerical Taxonomy (pp. 484-488). Berlin, Heidelberg: Springer.