BibTeX, biblatex and biber ⇒ Problem with same author same year citations

[snowfrog]

Hi all,

I am using natbib, \bibliographystyle{apalike}.

I have the following 2 references in my .bib file:

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@article{EssPoms04,
       author = {Essery, R. and Pomeroy, J.},
       title = {{Vegetation and Topographic Control of Wind-Blown Snow Distributions in Distributed and Aggregated Simulations for an Arctic Tundra Basin}},
       journal = {{Journal of Hydrometeorology}},
       volume = {5},
       pages = {735-744},
       year = {2004}}

@article{EssPoms04b,
Author = {Essery, R. and Pomeroy, J.},
Title = {{Implications of spatial distributions of snow mass and melt rate for snow-cover depletion: theoretical considerations}},
Journal = {{Annals of Glaciology}},
Volume = {38},
Pages = {261-265},
Year = {2004}}

In my thesis, I need the top reference to come up as Essery and Pomeroy (2004a) and the bottom as Essery and Pomeroy (2004b) but no matter what I try, the 1st reference comes up as 2004b. I don't think I had that problem with other same author / same year papers so I am a bit stunned. I also tried to have

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@article{EssPoms04a,

for the top reference but nothing changes.

How does bibtex choose which one is a and which one is b? Is it alphabetical? Is it because the title of the 1st paper starts with a "V" and the tile of the 2nd starts with an "I"?

Can anybody suggest what I can do to have the references in the order I need?

[kostas]

The ordering does not make sense indeed. It seems that, given the same author(s) and the same year, the ordering just follows the order in the .bib file.

Did you try swapping the order of the two articles within the .bib file?