Aggarwal، Rajesh. K.، Samwick، Andrew. A. (2003). Why do managers diversify their firms? Agency reconsidered. Journal of Finance، 71-118.
Babaei Zakliki, Mohammad Ali, Hedayati, Shohreh. (2005). Exploring synergy management of holdings. Journal of Management message, NO (17) , 133-158. (in Persian).
Babaei Zakliki, Mohammad Ali. (2004). Study of the properties and performance of the holding companies in Iran. Second International Conference on Management. (in Persian).
Berger، Philip. G.، Ofek، Eli. (1995). Diversification's effect on firm value. Journal of financial economics، 37 (1)، 39-65.
Chen، Sheng-syan.، Ho، Kim Way. (2000). Corporate diversification، ownership structure، and firm value: The Singapore evidence. International Review of Financial Analysis، 9 (3)، 315-326.
Dimitrov، Valentin.، Tice، Sheri. (2006). Corporate diversification and credit constraints: Real effects across the business cycle. Review of Financial Studies، 19 (4)، 1465-1498.
Erdorf، Stefan.، Hartmann-Wendels، Thomas.، Heinrichs، Nicolas.، Matz، Michael. (2013). Corporate diversification and firm value: a survey of recent literature. Financial Markets and Portfolio Management، 27 (2)، 187-215.
Ghosh، Aloke.، Jain، Prem. C. (2000). Financial leverage changes associated with corporate mergers. Journal of Corporate Finance، 6 (4)، 377-402.
Khodamoradi، Saeed.، NazemBokaee.، Jalilian، Jamal. (2012). Relationships between corporate diversification with economic performance variables (EVA، REVA). Archives Des Sciences، 65 (6).
Kuppuswamy، Venkat.، Villalonga، Belen. (2007). Does diversification create value in the presence of external financing constraints? Evidence from the 2007–2009 financial crisis. Working paper، Harvard business school.
Lang، Larry. H.، Stulz، Rene. M. (1993). Tobin's q، corporate diversification and firm performance (No. w4376). National Bureau of Economic Research.
Lewellen، Wilbur. G. (1971). A pure financial rationale for the conglomerate merger. Journal of Finance، 26 (2)، 521-537.
Rumelt، Richard. P. (1982). Diversification strategy and profitability. Strategic management journal، 3 (4)، 359-369.
Santalo، Juan.، Becerra، Manuel. (2008). Competition from specialized firms and the diversification–performance linkage. The Journal of Finance، 63 (2)، 851-883.
Stulz، Rene. (1990). Managerial discretion and optimal financing policies. Journal of financial Economics، 26 (1)، 3-27.
Tehrani Reza, Babaei Zakliki ,Mohammad Ali and Karimi Kiyana. (2008). The impact of diversification strategy on financial performance of Tehran Stock Exchange listed firms, Financial research , NO (25) , 21-40. (in Persian).
Tehrani Reza, Vahed Ahmadian Hadi. (2006). The survey of the relationship between product diversification and stock return of … firms listed in Tehran Stock Exchange, journal of commerce, NO (38) , 187-212. (in Persian).
Volkov، Nikanor.، Smith، Garret C. (2015). Corporate diversification and firm value during economic downturns. The Quarterly Review of Economics and Finance، NO (55)، 160-175.
Yan، An.، Yang، Zaihui.، Jiao، Jie. (2010). Conglomerate investment under various capital market conditions. Journal of Banking & Finance، 34 (1)، 103-115