BibTeX, biblatex and biber ⇒ Sequential citation

[thmosqueiro]

Yo!

I use natbib with the following options: numbers, comma, super, sort&compress. This way, if I want to cite 1,2,3,6 and 7 I get "1-3,6,7". This is exactly what the package should do, and I am perfectly fine with this. However, the correct way to do this, according to my library specifications, for thesis, is "1-3,6-7", i.e., even for sequence of two citations I should use "-" instead of comma.

I wans't able to find any option for natbib that would do that, and I have also tried to look at the natbib.sty - no solutions 'till now. Anyone with some brilliant idea?

Thanks in advance,
Thiago