00330nam a2200121Ia 4500008004100000040001700041041001200058082001400070100001800084245004700102260004800149300001100197230917s9999||||xx |||||||||||||| ||und||  e147287aMAIN  aEnglish  a320 B 21P  aBall, Terence 0aPolitical innovation and conceptual change  aCambridgebCambridge University Pressc1989  a366 p.