. . "Dark matter." . . "X Rays." . . "Galactic evolution." . . . . . . . "Studies of the evolution of the X-ray emission of clusters of galaxies"@en . . . . . . . . . . . . . . "Final technical report studies of the evolution of the X-ray emission of clusters of galaxies"@en . . . "Galactic clusters." . . "Luminosity." . . "Astronomical models." . .