%0 Journal Article %A Hamid Said %T An analytical mechanics approach to the first law of thermodynamics and construction of a variational hierarchy %J Theoretical and applied mechanics %D 2021 %P 1 %V 48 %N 1 %U http://geodesic.mathdoc.fr/articles/10.2298/TAM200315011S/ %R 10.2298/TAM200315011S %G en %F 10_2298_TAM200315011S