00305nam a2200121Ia 4500008004100000041000800041082001400049100002100063245002500084260003900109300002300148365001200171240624s9999    xx            000 0 und d  aeng  a519.5 MAR  aMARKUS GREGORY B  aANALYZING PANEL DATA  c1979aNew DelhibSage Publications  a72 : p. : cm. ; 21  cBPSb30