A tribute to Professor Philippe G. Ciarlet on his 70th birthday
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1.
Laboratoire Jacques-Louis Lions, Université Pierre et Marie Curie, B.C. 187, 75252 Paris
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2.
Institute of Mathematics “Simion Stoilow” of the Romanian Academy, P.O. Box 1-764, 014700 Bucharest, Romania, Department of Mathematics, University of Craiova, 200585 Craiova
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3.
Department of Mathematics, City University of Hong Kong, Kowloon