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Sabri Mohammed, M. and A. Salal , D. 2022. Numerical Analysis of Natural Frequency for U-Shaped Expansion Bellows in Fixed-Fixed and Fixed-Free Conditions. Diyala Journal of Engineering Sciences . 15, 3 (Sep. 2022), 106–116. DOI:https://doi.org/10.24237/djes.2022.15311.