1. Euleri Leonhardi Opera Omnia, Vol. X, ser. secundae, Society for Natural Sciences of Switzerland, 1960, in particular the section of C. Truesdell's historical notes, p. 1638–1788, on the rational mechanics of flexible or elastic bodies.
2. The shape of the strongest column
3. Strongest Columns and Isoperimetric Inequalities for Eigenvalues
4. Optimal design against structural vibration and instability, Ph. D. Thesis, Technical University of Denmark, Dept. of Solid Mechanics, Lyngby, Denmark, November 1978.