1. What is a wave?
2. Heat conduction is a can of worms
3. J. C. Maxwell, Phil. Trans. R. Soc. Lond. 155, 459–512 (1865). http://www.bem.fi/library/1865-001.pdf
4. H. Hertz, Sitzungsbr. d. Berl. Akad. d. Wiss. Feb. 2, 1888. Wiedemann’s Ann. 34), English Translation by D.E. Jones. http://onlinebooks.library.upenn.edu/webbin/book/lookupname?key=Hertz%2C%20Heinrich%2C%2018 57-1894
5. Matthew N. O. Sadiku, Principles of Electromagnetics (4th edition 21st impression 2015), pp. 377.