A conforming finite element method with Lagrange multipliers for the biharmonic problem
RAIRO. Analyse numérique, Tome 14 (1980) no. 3, pp. 309-324. 
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     title = {A conforming finite element method with {Lagrange} multipliers for the biharmonic problem},
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Pitkaranta, Juhani. A conforming finite element method with Lagrange multipliers for the biharmonic problem. RAIRO. Analyse numérique, Tome 14 (1980) no. 3, pp. 309-324. http://www.numdam.org/item/M2AN_1980__14_3_309_0/

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