The Bell System Technical Journal. — 1936. — Volume 15, Issue 1. — P. 92-112 .
After a review of the general aspects of the classical electromagnetic theory several "equivalence" theorems are established and illustrated with a number of examples from the diffraction theory. Then follows a discussion of possible applications of these theorems to radiation problems. The latter part of the paper is devoted to the calculation of the power radiated from an open end of a coaxial pair.
