Multiple "et al" citations with same first author but different co-authors -- how to combine them

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Hi,

did anyone solved this problem?

I am experiencing the same issue while citing two references with the same first author but different co-authors.

What I see is:

Smith et al, 2018a; Smith et al, 2018b

While I would like to have:

Smith et al, 2018a, b

Is there anyone who can help me?

Thank you.