1. Burke, W.L.: Space-Time, Geometry, Cosmology. University Science Books, Mill Valley (1980)
2. Burke, W.L.: Manifestly parity invariant electromagnetic theory and twisted tensors. J. Math. Phys. 24(1), 65 (1983)
3. Dirac, P.M.: Quantised singularities in the electromagnetic field. Proc. R. Soc. Lond. A133, 60 (1931)
4. Dirac, P.M.: The monopole concept. Int. J. Theor. Phys. 17, 235–247 (1978)
5. Edelen, D.G.B.: Applied Exterior Calculus. Wiley, New York (1985)