<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&amp;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,&nbsp;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&amp;_udi=B6VBS-4SXC91X-1&amp;_user=10&amp;_rdoc=1&amp;_fmt=&amp;_orig=search&amp;_sort=d&amp;view=c&amp;_acct=C000050221&amp;_version=1&amp;_urlVersion=0&amp;_userid=10&amp;md5=100d63e7e53cbd43c8316d4bb775b9e1</p><p></p>
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