00481nam a2200169Ia 4500003000400000008004100004040001600045082001600061100001600077245005900093700002400152260005100176300001000227650002200237650002700259650002500286GCL140319s9999    xx            000 0 eng d  aGCL / cGCL04a401.93bH P1 aVIBERG, AKE10aPROGRESSION AND REGRESSION IN LANGUAGE / cVIBERG, AKE1 aHYLTENSTAM, KENNETH  a[S.N] : bCAMBRIDGE UNIVERSITY PRESS ، c1993  a487 P04aLINGUISTIC CHANGE04aLANGUAGE - ACQUISITION04aLANGUAGE - ATTRITION