no. 4
A mixed-Lagrange multiplier finite element method for the polyharmonic equation
ESAIM: Modélisation mathématique et analyse numérique, Tome 19 (1985) no. 4, pp. 519-557. 
@article{M2AN_1985__19_4_519_0,
     author = {Bramble, James H. and Falk, Richard S.},
     title = {A {mixed-Lagrange} multiplier finite element method for the polyharmonic equation},
     journal = {ESAIM: Mod\'elisation math\'ematique et analyse num\'erique},
     pages = {519--557},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {19},
     number = {4},
     year = {1985},
     mrnumber = {826223},
     zbl = {0591.65073},
     language = {en},
     url = {http://www.numdam.org/item/M2AN_1985__19_4_519_0/}
}
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Bramble, James H.; Falk, Richard S. A mixed-Lagrange multiplier finite element method for the polyharmonic equation. ESAIM: Modélisation mathématique et analyse numérique, Tome 19 (1985) no. 4, pp. 519-557. http://www.numdam.org/item/M2AN_1985__19_4_519_0/

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