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A note on the Ritz approach to the extremal curves
Theoretical and applied mechanics, Tome 20 (1994) no. 1, p. 59 Cet article a éte moissonné depuis la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

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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. 
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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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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/