A. G. Galumian and H. M. Arakelian, “MATHEMATICAL COMPARISON OF TWO WELL-KNOWN PATTERNS OF MATERIAL EQUATIONS FOR GYROTROPIC MEDIA”, Proc. YSU A: Phys. Math. Sci., vol. 36, no. 3 (199), pp. 35–40, Sep. 2002, doi: 10.46991/PYSUA.2002.36.3.035.