Brackbill, J.U; Barnes, D.C (May 1980). "The Effect of Nonzero ∇ · B on the numerical solution of the magnetohydrodynamic equations". Journal of Computational Physics. 35 (3): 426–430. Bibcode:1980JCoPh..35..426B. doi:10.1016/0021-9991(80)90079-0.
Brackbill, J.U; Barnes, D.C (May 1980). "The Effect of Nonzero ∇ · B on the numerical solution of the magnetohydrodynamic equations". Journal of Computational Physics. 35 (3): 426–430. Bibcode:1980JCoPh..35..426B. doi:10.1016/0021-9991(80)90079-0.
Magnetic Monopoles, report from Particle data group, updated August 2015 by D. Milstead and E.J. Weinberg. "To date there have been no confirmed observations of exotic particles possessing magnetic charge."