  A paper about variable stars with possible multiple occurrence in the VSX
catalogue is presented. Our main criteria for identification of such
duplicities were the angular distance among stars (below 1 arcmin) and close
periods of objects. In our approach, we also considered double or half values
of periods to reveal possible misclassification among stars with similar light
curve shapes. The probability of false identification is expressed by the
parameter R giving the relative difference between periods. We found 1487 pairs
of stars in angular distance lower than 1 arcmin with period difference R lower
than 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 as
definite duplicates. The main contribution of certain duplicates comes from the
Catalina Sky Survey (73 pairs have two names with CSS acronym) and from the
BEST projects (71 pairs). Distribution of identified duplicates on the sky is
not homogeneous but contains surprising depression in Galactic plane.
