Sander, Christian Max Planck Institute for Medical Research, Max Planck Society;
https://www.sciencedirect.com/science/article/pii/0022283680900522/pdf?md5=51b1fd89094c6e79ffb5dabc1762c06b&pid=1-s2.0-0022283680900522-main.pdf (Any fulltext)
https://doi.org/10.1016/0022-2836(80)90052-2 (Any fulltext)
Lifson, S., & Sander, C. (1980). Specific recognition in the tertiary structure of β-sheets of proteins. Journal of Molecular Biology (London), 139(4), 627-639. doi:10.1016/0022-2836(80)90052-2.