Geodesic
Some remarks on the application of the energy variational principles in the finite element method
Theoretical and applied mechanics, Tome 14 (1988) no. 1, p. 117 Cet article a éte moissonné depuis la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

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Disadvantages of energy variational principles in the finite element method are considered. In the case when the distribution function of a higher order, additional nodal forces appear, which are not a consequence of the crossing forces ($\Delta K_1$). The energy approach also includes quantities with different physical values ($\Delta K_2$ - “parasitic stresses”). These influences are the main reason that elements of a higher order or irregular shape give unsatisfactory results. All these shortcomings are successfully rejected by using the direct method of development finite elements. 
@article{TAM_1988_14_1_a11,
     author = {Apostol Poceski},
     title = {Some remarks on the application of the energy variational principles in the finite element method},
     journal = {Theoretical and applied mechanics},
     pages = {117 },
     year = {1988},
     volume = {14},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAM_1988_14_1_a11/}
}
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Apostol Poceski. Some remarks on the application of the energy variational principles in the finite element method. Theoretical and applied mechanics, Tome 14 (1988) no. 1, p. 117 . http://geodesic.mathdoc.fr/item/TAM_1988_14_1_a11/