A4W. US Navy Propulsion Systems. 美國科學家聯盟. 1999-02-27 [2006-10-16]. (原始内容存档于2006-09-25). current cores for the NIMITZ Class aircraft carrier ... last on average about 20 years
A4W. US Navy Propulsion Systems. 美國科學家聯盟. 1999-02-27 [2006-10-16]. (原始内容存档于2006-09-25). current cores for the NIMITZ Class aircraft carrier ... last on average about 20 years