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The sums over (e,e') spectra of 6Li and 7Li nuclei which correspond to thelongitudinal sum rule are studied. It is suggested that due to the clusterstructure of the lithium isotopes these sums may approximately be expressed interms of such a sum pertaining to the alpha-particle. Calculation of these sumsis performed in the framework of cluster models with antisymmetrization donewith respect to all the nucleons. At momentum transfers higher than 0.8 fm^{-1}the relations expressing the A=6 or 7 sum in terms of the A=4 sum prove to bevalid with rather high accuracy. In the region of momentum transfers around 1fm^{-1} the longitudinal correlation functions of 6Li and 7Li nuclei are foundto be close to that of the alpha-particle. The experimental longitudinal sumsin the range between 0.450 and 1.625 fm^{-1} are employed to perform comparisonwith those calculated in the framework of cluster models. Out of the mentionedexperimental sums, those in the range between 0.750 and 1.000 fm^{-1} in the6Li case and between 0.750 and 1.125 fm^{-1} in the 7Li case are obtained inthe present work. In the 6Li case a complete agreement is found while in the7Li case an agreement only at a qualitative level is observed.

Relation between (e,e') sum rules in 6,7Li and 4He nuclei.Experiment and cluster model