Marek Jarnicki, Jagiellonian University in Kraków, Poland; Peter Pflug, Carl von Ossietzky University of Oldenburg, Germany.
""One sees how rich this book is! Of course, the general theory of Riemann domains over Stein manifolds is not studied. But the reader who has understood this book can easily study the general theory. I think it is really the best reference book for the extension problem of holomorphic functions."" Mathematical Reviews