no. 3
A family of C 1 finite elements with optimal approximation properties for various Galerkin methods for 2nd and 4th order problems
RAIRO. Analyse numérique, Tome 13 (1979) no. 3, pp. 227-255. 
@article{M2AN_1979__13_3_227_0,
     author = {Douglas, Jim Jr. and Dupont, Todd and Percell, Peter and Scott, Ridgway},
     title = {A family of $C^1$ finite elements with optimal approximation properties for various {Galerkin} methods for 2nd and 4th order problems},
     journal = {RAIRO. Analyse num\'erique},
     pages = {227--255},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {13},
     number = {3},
     year = {1979},
     mrnumber = {543934},
     zbl = {0419.65068},
     language = {en},
     url = {http://www.numdam.org/item/M2AN_1979__13_3_227_0/}
}
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Douglas, Jim Jr.; Dupont, Todd; Percell, Peter; Scott, Ridgway. A family of $C^1$ finite elements with optimal approximation properties for various Galerkin methods for 2nd and 4th order problems. RAIRO. Analyse numérique, Tome 13 (1979) no. 3, pp. 227-255. http://www.numdam.org/item/M2AN_1979__13_3_227_0/

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