call-next-method with arguments: what object instance do I specify?

This is a blatant help request - time is getting short ...

I have methods that calculate coefficients. Object A has its method,
object B, who is A's subclass inherits A.

Now, the method specializing on B needs to call the method
specializing on A, with its own arguments. So, I need to pass the
list of arguments. But the first argument of A's method is the
class. Do I have to specify it or will the whole method-combination
machinery figure that out?

If I need to specify it A's class, how do I identify it, knowing only
B's class?

Thanks for your help.

Mirko
.

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