1. [1] Ph. Boulanger, M. Destrade, M. Hayes, Inhomogeneous"longitudinal" circularly-polarized plane waves in anisotropic elastic crystals, Acta Acustica, 92(2006), 247-250.
2. [2] Ph. Boulanger, M. Hayes, Electromagnetic plane waves in anisotropic media an approach using bivectors,Phil. Trans. R. Soc. A, 330(1990), 335-393.
3. [3] Ph. Boulanger, M. Hayes, Bivectors and waves in Mechanics and Optics Chapman & Hall, New Delhi, 1993.
4. [4] S. Chirita, I. Ghiba, Inhomogeneous plane waves in elastic materials with voids, Wave Motion, 47(2010), 333-342.
5. [5] J.W. Gibbs, Elements of vector analysis, Scientific papers vol.2, part 2, Doves Publication, New York, 1961.