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Liu, G.L. Comments and author's reply on “Derivation and transformation of variational principles with emphasis on inverse and hybrid problems in fluid mechanics: a systematic approach” by G.-L. Liu [Acta Mechanica 140, 73–89 (2000)]. Acta Mechanica 149, 247–250 (2001). https://doi.org/10.1007/BF01261676
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DOI: https://doi.org/10.1007/BF01261676