TY  - BOOK
AU  - Li Ping
AU  -  Shirai Yasuhiro
TI  - Acquisition of lexical and grammatical aspect
T2  - Studies on language acquisition
U1  - P:(S:4), P0 
PY  - 2000///
CY  - Berlin
PB  - Mouton de gruyter     
KW  - LINGUISTICS
ER  -