Developer Forum

I am using natbib, and would like references in authoryear style.

If I have a few references in my .bib file, eg:

{Able2008
Author = {Able, A. and Brown, A. and Clark, A. and Dixon, A. and
Engl, A.},
...
Year = (2008} }

{Able2009_1
Author = {Able, A. and Brown, A. and Clark, A. and Dixon, A. and
Engl, A.},
...
Year = (2009} }

{Able2009_2
Author = {Able, A. and Brown, A. and Clark, A. and Engl, A. and
Dixon, A. },
...
Year = (2009} }

and type in my TeX doc:
... some text \citep{Able2008, Able2009_1, Able2009_2} some more
text .....

I would like it to look like
... some text (Able2008; Able2009a; Able2009b) some more text .....
or
... some text (Able2008; Able2009a,b) some more text .....

but I actually get:
... some text (Able2008; Able, Brown, Clark, Dixon and Engl, 2009;
Able, Brown, Clark, Engl and Dixon, 2009) some more text .....

I have included:

\usepackage[compress]{natbib}

\usepackage[plainpages=false,pdfpagelabels]{hyperref}
\usepackage{hypernat}

I am using
Windows XP
TeXnicCenter 1.0
hyperref 2008-11-21
natbib 2009-02-08

(Also, dumb q. re: hypernat, I don't have hypernat in my Miktex, I
updated today and it hasn't been loaded, haven't worked out how to get
it as a separate package)

Help would be much appreciated.

thanks,
Kathryn