The late Alexander (Sasha) Rosenberg, has a webpage collecting (some of) his work. Of course, most of his works were available through the preprint server of the Max--Planck Institute, but now things are easy accessible. It only went online a few days or weeks ago I think, and I guess it is maintained by his son Leo. There is also a book containing selected papers, which seems to be the print version of the website I linked.