Geodesic
An extremum variational principle for Föppl-Hencky equation
Theoretical and applied mechanics, Tome 12 (1986) no. 1, p. 3 
Teodor Atanacković; Manfred Achenbach. An extremum variational principle for Föppl-Hencky equation. Theoretical and applied mechanics, Tome 12 (1986) no. 1, p. 3 . http://geodesic.mathdoc.fr/item/TAM_1986_12_1_a0/
@article{TAM_1986_12_1_a0,
     author = {Teodor Atanackovi\'c and Manfred Achenbach},
     title = {An extremum variational principle for {F\"oppl-Hencky} equation},
     journal = {Theoretical and applied mechanics},
     pages = {3 },
     year = {1986},
     volume = {12},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAM_1986_12_1_a0/}
}
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Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

An extremal variation principle and the Feiler estimation method for Föppl-Hencky differential equations are given. Approximation (approximation) solutions for two load parameters are given.