BibTeX, biblatex and biber ⇒ appending a, b, c, etc. to year in the Chicago style

[M.L.]

Hi group,

I am having a problem with citations using the chicago style (I also use the natbib package if that matters). In the cases where I reference two papers that have the same author, I would like to have a, b, c etc. appended to the year in the citation, e.g., Doe et al. (2008a). That didn't happen and I have isolated the problem to be related to the *full* author list of the paper I am referencing, not just the first author. If the *whole* list is identical between the papers, I get the desired behavior, if not, the citation in the text for both papers look the same, i.e., Doe et al. (2008), even though they refer to two different papers.

Is there anything to do to correct this? Am I the only one having this problem with the chicago style? (It works as I expect with other styles, but I like the design of the chicago).

Thanks!

best,

M.L.

[M.L.]

*bump*

No-one?

M.L.