South Azerbaijan 
South Azerbaijan is another common name of Azerbaijan (Iran), it should be noted in article.
Rural transition in Azerbaijan by Zvi Lerman, David J. Sedik - Page 11:A Brief History of South Azerbaijan 
Azerbaijan: a quest for identity  a short history by Charles van der Leeuw - Page 94
Azerbaijan Since Independence- by Svante E. Cornell Page 41
 
Iran's political, demographic, and economic vulnerabilities - by Keith Crane, Rollie Lal, Jeffrey Martini Page 54