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A series of long-period superstructures have been found in the quasi-binary Co3V-Ni3V system. These structures are specified by the stacking sequence of close-packed planes and the atomic order within the planes, and appear successively in the order 3T (Co3V), (2)3T, 1T, 1TR, 1TR2, 1R, (3)3R, 3R and 1R (Ni3V) with the increase of nickel concentration. The stabilization of the long-period structures is discussed briefly in terms of oscillatory interatomic potentials.