Trajectories of Artificial Celestial Bodies as Determined from Observations Trajectoires des Corps Celestes Artificiels Déterminées D’après les Observations formatIsbn:Softcover 9783642493287 both generally and in mineral formatIsbn:Softcover 9789402404937 both generally and in mineral environments Much effort has gone into making this book logically and pedagogically satisfactory and Bergmann has spent many hours with me which were devoted to this end A new symposium seemed therefore suitable to determine these recent advances The papers submitted during this meeting have been published in 1963 in a collection entitled "Dynamics of Satellites" by Springer Verlag