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I finally found a solution, biblatex is able to do this without mutlibib. Section 3.14.3 (Multiple Bibliographies) in their documentations explains multiple ways.

Okay, I see. But this does not help in my case because I need to cite several pages from a book and they need to be displayed in the text.

\cite[see][p. 100]{a} works using biblatex, see the example below.

\documentclass{article}

\usepackage{biblatex}
\usepackage{filecontents}
\begin ...

why don't you put the information about page 100 into the bibfile? I think that would be easier

Sorry, I don't exactly understand what you mean.
The author abbreviation is generated, and I need custom text before and after it, is this possible by adding something to the bibfile?
Also e.g. this ...

Hello,

I need to implement quite specific citations. I need multiple bibliographies (using multibib for that) and a citation should look like this example:
[see Aut00, p. 100]

So there needs to be text before and after the author/year abbreviation.

The Bibliography should consist of sections in ...