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Abstract : The effects of volumetric visco-elasticity are investigated for several linear visco-elastic materials under simple loading conditions. In particular, the operators V(D), corresponding to the Poisson ratio of an elastic solid, and the functions V(t) equals - E sub 22 (t)/E sub 11 (t) (where E sub 11 and E sub 22 are the longitudinal and the lateral strains in uniaxial state of stress) are discussed. (Author)