Geodesic
A note on the Ritz approach to the extremal curves
Theoretical and applied mechanics, Tome 20 (1994) no. 1, p. 59 
Đ. S. Đukić; T. M. Atanacković. A note on the Ritz approach to the extremal curves. Theoretical and applied mechanics, Tome 20 (1994) no. 1, p. 59 . http://geodesic.mathdoc.fr/item/TAM_1994_20_1_a5/
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     author = {{\DJ}. S. {\DJ}uki\'c and T. M. Atanackovi\'c},
     title = {A note on the {Ritz} approach to the extremal curves},
     journal = {Theoretical and applied mechanics},
     pages = {59 },
     year = {1994},
     volume = {20},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAM_1994_20_1_a5/}
}
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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

Approximation of extremals by the Ritz method is considered. The corresponding extremals belong to the class $\mathbf D_1$, $\mathbf D_2$ or $\mathbf D_3$. Approximative lines of classes $\mathbf D_1$ are used for solving problems.