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2. Truesdell, C., Rational Thermodynamics. New York: McGraw-Hill 1969.
3. Onat, E. T., The Notion of State and Its Implications in Thermodynamics of Inelastic Solids, pp. 292?314 in: Proc. 1966 IUTAM Symposium, H. Parkus & L. I. Sedov, Ed. Berlin-Heidelberg-New York: Springer 1968.
4. Onat, E. T., Representation of Inelastic Mechanical Behavior by Means of State Variables, pp. 213?224 in: Proc. 1968 IUTAM Symposium, B. A. Boley, Ed. Berlin-Heidelberg-New York: Springer 1970.
5. Kalman, R. E., P. L. Falb, & M. A. Arbib, Topics in Mathematical System Theory. New York: McGraw-Hill 1969.