BibTeX, biblatex and biber ⇒ natbib | Sort Order of multiple Articles by same Author

[sagittarius5962]

Hi,

I am using natbib to generate reference list in alphabetical-chronological order. The problem is that although the generated reference list is in alphabetical order, the multiple articles of the same author are not sorted in chronological order. This problem happens if the author is the single author of the article. If there are multiple authors, the alphabetical chronological order is generated correctly. For example, the wrong list looks like:

Hill (2002), article 1
Hill (2004), article 2
Hill and Smith (1996), article 3

While I want it to be:

Hill and Smith (1996), article 3
Hill (2002), article 1
Hill (2004), article 2

Thanks for your help in advance.