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Pandit, M. K.; Sheikh, A. H.; Singh, B. N. . (2010). Analysis of Laminated Sandwich Plates Based on an Improved Higher Order Zigzag Theory. Journal of Sandwich Structures and Materials, 12(3), 307–326. doi:10.1177/1099636209104517 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research