TY - JOUR AU - Zdeněk Sobotka TI - Functional relations in non-linear viscoelastjcity JO - Theoretical and applied mechanics PY - 1976 SP - 121 VL - 2 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TAM_1976_2_1_a15/ LA - en ID - TAM_1976_2_1_a15 ER -