%0 Journal Article %A Zdeněk Sobotka %T Functional relations in non-linear viscoelastjcity %J Theoretical and applied mechanics %D 1976 %P 121 %V 2 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/TAM_1976_2_1_a15/ %G en %F TAM_1976_2_1_a15