Salisbury, Donald C. Department Structural Changes in Systems of Knowledge, Max Planck Institute for the History of Science, Max Planck Society;
https://link.springer.com/article/10.1140/epjh/s13129-022-00039-8 (Any fulltext)
Salisbury, D. C. (2022). A History of Observables and Hamilton–Jacobi Approaches to General Relativity. European Physical Journal H, 47(Article 7). doi:10.1140/epjh/s13129-022-00039-8.