The solution works for me.
See http://wiki.lyx.org/LyX/HumanitiesLyX
Using NatbibTo set up LyX to use natbib, go to
Document→Settings→Bibliography and check natbib.
Add the following line to your LaTeX preamble:
\bibpunct{(}{)}{,}{a}{,}{,}
This specifies in-text punctuation options for citations, i.e., Author
(Year), commas between citations, and so on. See the natbib documentation
for details.
--
Albert
Lab of Complex System and Artificial Intelligence,
Institute of Automation,Chinese Academy of Sciences(CASIA)
Beijing, 100190,P.R.CHINA
