citation delimiters

I have encountered a difficult requirement in the style instructions that I'm trying to 'translate' into csl.

If there is more than one work by the same author in one citation they should be separated by commas, i.e.: (Christensen, 2003, 2006). Except when there is page references, in which case the works should be separated by semicolons, i.e.: (Christensen, 2003, s. 24-28; 2006, s. 34)

As far as I can see, this is not possible in CSL. Does anyone have an idea for a workaround?
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