ProQuest Digital Dissertations UMI DIGITAL LIBRARY OF DISSERTATIONS AND THESES Providing a Digital Library for Authors, Researchers, and Graduate Institutions SEARCHING Conduct a quick search below, or go to the main search page for a more detailed search. F Keywor d in title/abstract C Author last name, or last name, first name.(e.g. Smith or"Smith, Jane") C Publication number 提交查询内容 You are searching all dissertations published in 1998 and 1999 A BOUT O Dissertation Abstracts Database and Digital Dissertations Downloading Full Text Dissertations(PDF files)快速检索方式