Mandarin question forms

[Madalena Cruz-Ferreira]

Dear all,

A graduate student of mine is looking for literature on stages in the acquisition of question forms in Mandarin. 
She has checked the chibib and the Childes Mandarin database.
Could anyone help with other pointers?
Please reply to me for the time being, she has just subscribed to this network but there were some problems accessing it.
Thank you!

Madalena

======================================
Madalena Cruz-Ferreira
Dept. English Language and Literature
National University of Singapore
ellmcf at nus.edu.sg
======================================