Discovery and rediscovery of Trojan asteroids

During 1987-1994, observational campaigns with different telescopes at several observatories have been initiated by the author in order to discover new Trojans. The importance of Trojan asteroids comes from celestial mechanics, where they represent the physical solution of the famous Lagrange triangular problem. Their importance lies also in the fact, that they may have some relation with comets. Furthermore, the Trojan belt may be as large as the belt of asteroids. Moreover, recently ''families'' have been discovered between the already well known Trojans. Enough reasons to continue to search for these interesting objects.