Geodesic
Homogeneous deformation process with minimal stress work
Theoretical and applied mechanics, Tome 4 (1978) no. 1, p. 3 
Teodor M. Atanacković. Homogeneous deformation process with minimal stress work. Theoretical and applied mechanics, Tome 4 (1978) no. 1, p. 3 . http://geodesic.mathdoc.fr/item/TAM_1978_4_1_a0/
@article{TAM_1978_4_1_a0,
     author = {Teodor M. Atanackovi\'c},
     title = {Homogeneous deformation process with minimal stress work},
     journal = {Theoretical and applied mechanics},
     pages = {3 },
     year = {1978},
     volume = {4},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAM_1978_4_1_a0/}
}
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The paper analyzed the conditions that a homogeneous deformation process should satisfy in order for the deformation work during that deformation process to be minimal. One new feature of the elasticity tensor is pointed out, which is related to singular optimal solutions.