Vector:

• http://en.wikipedia.org/wiki/Vector_(spatial)

Poynting Vector:

• http://en.wikipedia.org/wiki/Poynting_vector
• Module 27: Poynting Vector and Energy Flow
• https://www.britannica.com/search?query=poynting%20vector

Discussion of Poynting Vectors of static fields:

• http://www.lns.cornell.edu/spr/2002-06/msg0042214.html

What is a Poynting Vector?/h1>