Treatise on Classical Elasticity: Theory and Related Problems - Petre P. Teodorescu - Google Books

https://books.google.de/books?id=nvVq1R9raogC&pg=PA19#v=onepage&f=false

Deformable solids have a particularly complex character; mathematical modeling is not always simple and often leads to inextricable difficulties of computation. One of the simplest mathematical models and, at the same time, the most used model, is that of…