1. 1Griffiths, D., Introduction to Electrodynamics, 2nded.Prentice Hall, Englewood Cliffs, New Jersey,1989, pp.323-330.
2. 2Jackson, J., Classical Electrodynamics, 3rded.John Wiley and Sons, Hoboken, NewJersey,1999, pp.258-263.
3. SulĽelettrodinamica di minkowski