找几篇外文文献（opt.eng等）
我这里数据库资源有限，谁能给帮帮忙找找下面几篇文章啊，能找几个算几个，万分感激了 1. M. C. Gerchman and G. C. Hunter, “Differential technique for accurately measuring the radius of curvature of long radius concave optical surfaces,” Opt. Eng. 19, 843–848 (1980). l'4AF|
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2. M. V. R. K. Murty and R. P. Shula, “Measurement of long radius of curvature,” Opt. Eng. 22, 231–235 ~1983!. qG8s;_G
3．U. Griesmann, J. Soons, and Q. Wang, “Measuring form and radius of spheres with interferometry,” Ann. CIRP 53, 451– 454 (2004). 4. K. M. Medicus, “Improving measurements based on the cat’s eye retro-reflection,” Ph.D. dissertation (University of North Carolina at Charlotte, 2006). n/e
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