00394nam a2200145Ia 450000100060000000800410000602000180004704000130006508200190007810000230009724500630012026000470018330000110023054600070024157789140507s9999    xx            000 0 und d  a9788132110293  cPK-LaUMT  a 001.42bSWA-C  aSwanborn, Peter G.  aCase study research what, why and how?cSwanborn, Peter G.  aLos Angeles,USA:bSage Publications,c2010  a178 p.  aEN