00408nam a2200157Ia 4500008004100000020001500041082001800056100001900074245004400093260003600137300000800173650002000181653001600201653001300217653002000230170901s1984    xx            000 0 und d  a0803920571  a300.722bY-4C  aYin, Robert K. 0aCase Study ResearchbDesign and Methods  aLondonbSage Publicationsc1984  a160  aSocial sciences  aCase method  aResearch  aSocial sciences