Geodesic
Variational principle and error estimate for a non-linear heat conduction problem
Theoretical and applied mechanics, Tome 14 (1988) no. 1, p. 3 
T. M. Atanacković; Đ. S. Đukić; A. M. Strauss. Variational principle and error estimate for a non-linear heat conduction problem. Theoretical and applied mechanics, Tome 14 (1988) no. 1, p. 3 . http://geodesic.mathdoc.fr/item/TAM_1988_14_1_a0/
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     title = {Variational principle and error estimate for a non-linear heat conduction problem},
     journal = {Theoretical and applied mechanics},
     pages = {3 },
     year = {1988},
     volume = {14},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAM_1988_14_1_a0/}
}
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The variational principle for stationary heat conduction with temperature-dependent heat generation in cylinders and spheres is constructed. On the basis of this principle approximate solutions for several problems are obtained. Also, error of such approximate solutions is estimated.