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A paper about variable stars with possible multiple occurrence in the VSXcatalogue is presented. Our main criteria for identification of suchduplicities were the angular distance among stars (below 1 arcmin) and closeperiods of objects. In our approach, we also considered double or half valuesof periods to reveal possible misclassification among stars with similar lightcurve shapes. The probability of false identification is expressed by theparameter R giving the relative difference between periods. We found 1487 pairsof stars in angular distance lower than 1 arcmin with period difference R lowerthan 0.1 %, which are high-probable candidates on duplicates. From this sample,354 pairs have exactly the same periods (R = 0.0 %) and should be considered asdefinite duplicates. The main contribution of certain duplicates comes from theCatalina Sky Survey (73 pairs have two names with CSS acronym) and from theBEST projects (71 pairs). Distribution of identified duplicates on the sky isnot homogeneous but contains surprising depression in Galactic plane.

Possible candidates for multiple occurrence of variable stars in the VSX catalogue