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2. Foundations of Potential Theory;KELLOGG,1929
3. Theory of Thermal Stresses;BOLEY,1960
4. “Sulle equazioni integro-differenziali della teoria dell' elasticita”;VOLTERRA;Atti R. Accad. Linc.,1909
5. GURTIN, M. E. and STERNBERG, ELI. A Reciprocal Theorem in the Linear Theory of Anisotropic Viscoelastic Solids. Report No. 17, Contract Nonr-562(25), Brown University (September, 1962).