我们学校理应买了ECS的数据库的,可是为什么下载不了paper.有哪位虫子能帮我下载以下的paper?万分感谢! (1) Lehmann V, Föll H. Formation Mechanism and Properties of Electrochemically Etched Trenches in n‐Type Silicon[J]. Journal of The Electrochemical Society, 1990, 137(2): 653-659. (2)Lehmann V. The Physics of Macropore Formation in Low Doped n‐Type Silicon[J]. Journal of the Electrochemical Society, 1993, 140(10): 2836-2843.