1. A. Haas, Proc. of the Round-Table Discussion on Meas. Theory, 6th IMEKO, Dresden, 50, 1973.
2. A. Haas, VII. Hung. Conf. on, Automation, Budapest 1973, p. 15.
3. A. Haas, Revue Phil. de la France,2, 189, 1984.
4. I. Kirschner, Acta Phys. Hung.,29, 319, 1970; I. Kirschner, Acta Phys. Hung.,30, 33, 1971.
5. I. Gyarmati, Nonequilibrium Thermodynamics, Springer, Berlin, 1970.