Library of Congress. December 30, 2008 [July 22, 2009]. (原始内容存档于2014-08-10). Librarian of Congress Announces 2007 Film Registry (新闻稿). Library of Congress
page 10) (页面存档备份,存于互联网档案馆) Ruggles, Tyler H.; Caldeira, Ken. Wind and solar generation may reduce the inter-annual variability of peak residual load in certain