The OMX Nordic Exchange strengthens its position as a leading European marketplace (新闻稿). OMX. 2006-10-02 [2008-02-29]. Nasdaq bids $3.7bn for Nordic OMX
(PDF)于2010-10-18). Gerth, Jeff; Richard A. Oppel, Jr. Regulators struggle with a marketplace created by Enron. The New York Times. 2001-11-10 [2010-10-17]. (原始内容存档于2010-10-18)