1. Bozorth, R.M.: Ferromagnetism. van Nostrand, Princeton (1951)
2. Chikazumi, S.: Physics of Magnetism. Wiley, New York (1964)
3. Skomski, R., Coey, J.M.D.: Permanent Magnetism. Institute of Physics, Bristol (1999)
4. Consider ∇ . (A × H) = B . H, which follows from B = ∇ × A and H = - ∇ϕm. Since ∫ ∇ . (A × H) dV = ∫ (A × H) dS and the respective A and H fields decay as 1/r2 and 1/r3 in infinity, the surface integral and therefore ∫ B . H dV are equal to zero
5. Yensen, T.D.: Development of magnetic material. Elec. J. 18, 93–95 (1921)