<br /><br /><p>1</p>文献名:Environmental emissions and production economics: implications of the materials balance. <p></p>作者: Ebert, U., Welsch, H <p></p>期刊:American Journal of Agricultural Economics ., 2007.89, 287–293 <p></p><p>电子链接:http://www3.interscience.wiley.com/journal/118482096/abstract?CRETRY=1&SRETRY=0</p><p></p><p>2</p>文献名:On the Existence of Optimal Solutions to an Optimal Control Problem 作者:Majewski, M. <p></p><p>期刊:Journal of Optimization Theory and Applications, Volume 128, Number 3, March 2006 , pp. 635-651(17)</p><p>电子链接:http://www.ingentaconnect.com/content/klu/jota/2006/00000128/00000003/00009036;jsessionid=gsxe7vbmn0fl.alexandra</p><p></p><p>3</p><p>文献名:Perturbation methods in optimal control problems </p><p></p>作者:A.S. Buldaev <p></p><p></p><p>期刊:Ecological Modelling<br>Volume 216, Issue 2, 24 August 2008, Pages 157-159</p><p>电子链接:http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VBS-4SXC91X-1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=100d63e7e53cbd43c8316d4bb775b9e1</p><p></p>
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