Konferenzbeitrag
Portugues, R.: Magnetic monopoles in electromagnetism and gravity. In: Quantum Mechanics of Fundamental Systems: The Quest for Beauty and Simplicity, S. 197 - 212 (Hg. Zanelli, J.; Henneaux, M.). Meeting on Quantum Mechanics of Fundanental Systems - The Quest for Beauty and Simplicitt. Claudio Bunster Festschrift, Valdivua, Chile, 10. Januar 2008 - 11. Januar 2008. Springer, New York (2008)