00811nam0-22003011i-450-9900025886104033210-387-94482-6000258861FED01000258861(Aleph)000258861FED0100025886120000920d1995----km-y0itay50------baENGObservational studiesPaul R. Rosenbaum.New YorkSpringer Verlag1995.xv, 230 p.24 cmPiano degli esperimentiPianificazioni di indagini001.4Rosenbaum,Paul R.105235ITUNINARICAUNIMARCBK990002588610403321XV-A-453937MASMASObservational studies157342UNINAING01