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Konieczny, Mateusz; Achtelik, Henryk; Gasiak, Grzegorz . (2021). Location of stress concentration zones in a two-layer axially symmetrical perforated plate with force applied normally to its surface. Engineering Structures, 226(), 111355–. doi:10.1016/j.engstruct.2020.111355 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research