1. See, for example, Mason WeaverThe Electromagnetic FieldUniversity of Chicago Press 1929 184 184 and Zeleny and Page, Phys. Rev. xl. p. 305 (1932).
2. See, for example, Page AdamsPrinciples of ElectricityD. Van Nostrand Co. 1931 243 243
3. Maxwell , James Clerk . 1904.A Treatise on Electricity and Magnetism, third edition, Vol. ii, 175–175. Oxford: Clarendon Press.
4. See Mason WeaverThe Electromagnetic FieldUniversity of Chicago Press 1929 173 185