A conforming finite element method with Lagrange multipliers for the biharmonic problem
ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Tome 14 (1980) no. 3, pp. 309-324.
@article{M2AN_1980__14_3_309_0,
     author = {Pitkaranta, Juhani},
     title = {A conforming finite element method with Lagrange multipliers for the biharmonic problem},
     journal = {ESAIM: Mathematical Modelling and Numerical Analysis - Mod\'elisation Math\'ematique et Analyse Num\'erique},
     pages = {309--324},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {14},
     number = {3},
     year = {1980},
     zbl = {0467.65060},
     mrnumber = {592756},
     language = {en},
     url = {http://www.numdam.org/item/M2AN_1980__14_3_309_0/}
}
Pitkaranta, Juhani. A conforming finite element method with Lagrange multipliers for the biharmonic problem. ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et 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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