00333nam a2200133Ia 450000100060000000800410000602000070004704000130005408200180006724500450008526000510013030000110018154600070019256611140506s9999    xx            000 0 und d  aNA  cPK-LaUMT  aMAL 520bAST-  aAstronomy and astrophysics (proceedings)  aTexas,USA:bTexas tech university press,c1975  a179 p.  aEN