citation-label / trying to prepare ISTE stylesheet

Hi to all,
Is there a way to avoid four characters and no space when using the citation-label assigned by the CSL processor?

I would need to get this (ISTE stylesheet, see there):
[ALB 00] ALBERO B., L’autoformation en contexte institutionnel, du paradigme de l’instruction au paradigme de l’autonomie, L’Harmattan, Paris, 2000.

Instead, I get this;
[ALBE00] ALBERO B., L’autoformation en contexte institutionnel, du paradigme de l’instruction au paradigme de l’autonomie, L’Harmattan, Paris, 2000.

Thanks
Nicolas
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