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HANSELL, Saul; VANCE, Ashlee. Dell to Spend $3.9 Billion to Acquire Perot Systems (Published 2009). The New York Times. 2009-09-21. Dostupné online [cit. 2021-02-14]. ISSN0362-4331. (anglicky)
HANSELL, Saul; VANCE, Ashlee. Dell to Spend $3.9 Billion to Acquire Perot Systems (Published 2009). The New York Times. 2009-09-21. Dostupné online [cit. 2021-02-14]. ISSN0362-4331. (anglicky)