In 1990-1992, an international campaign of observations of mutual eclipses and occultations of the Galilean satellites, named PHEMU91, have been organized by the Bureau des longitudes.

A workshop held in november 1990 in Teramo (Italy) and was jointly organized by the Observatorio Astronomico di Collurania (Teramo Observatory) and the Bureau des longitudes.

The proceedings of the PHEMU91 workshop, Eds. J.-E. Arlot et R. Burchi, are avalaible on request to J.-E. Arlot, Bureau des longitudes.

The content of these proceedings is :