:::: Check this: 

 :::: Yet by the twentieth century the Azerbaijanis people, who had lived in Eastern Armenia for centuries, had become its silent guests, marginalized and discriminated against. The Armenians asserted their right to their homeland at the expense of these people. In 1918 – 1920, tens of thousands Azerbaijanis were expelled from Zangezur. In 1940s, tens of thousands more were deported to Azerbaijan to make way for incoming Armenian immigrants from Diaspora. The last cleansing, in 1988 – 1989, got rid of the rest.  

 :::: De Waal, Thomas. Black garden: Armenia and Azerbaijan through peace and war. New York: New York University Press, 2003. ISBN 0814719457