TY  - BOOK
AU  - VIBERG,AKE
AU  - HYLTENSTAM,KENNETH
TI  - PROGRESSION AND REGRESSION IN LANGUAGE / 
U1  - 401.93 
PY  - 1993///
CY  - [S.N] : 
PB  - CAMBRIDGE UNIVERSITY PRESS ، 
KW  - LINGUISTIC CHANGE
KW  - LANGUAGE - ACQUISITION
KW  - LANGUAGE - ATTRITION
ER  -