In the running Melkar-Knysh debate on Klejn's ideas, there's
considerable attention to Klejn's ideas, but no specific reference (if
there is one in a posting I missed, I apologize).
This note is to point to a clear statement of his as of 1984. You
might miss it because the name is given as "Kleijn", which I guess is
a less favored transliteration.
http://www.samorini.net/doc/alt_aut/ek/klejn.htm
Dan