求助英文文献两篇 第一篇网址: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TVW-46NY1DX-163&_user=1021790&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050480&_version=1&_urlVersion=0&_userid=1021790&md5=259428b15cdcfa87ba71d8da3c1bb212 第一篇题目: Dielectric and magnetoelectric properties of Bi5FeTi3O15 14R. S. Singh, T. Bhimasankaram, G. S. Kumar, and S. V. Suryananrayana, Solid State Commun. 91, 567 (1994) 第二篇网址: http://www.iop.org/EJ/article/0953-8984/11/16/014/c91613.pdf 杂志: 13A. Srinivas, S. V. Suryanarayana, G. S. Kumar, and M. M. Kumar, J. Phys.: Condens. Matter 11, 3335 (1999) 不胜感激