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The properties of superconductors near the tricritical Lifshitz(TL) point are studied. Unusual behavior ofH _c2(T) near the TL point in three-dimensional (3D) systems is found, as well as an oscillatory character ofH _c2(T) in quasi-2D systems. The oscillatory character of the critical currentj _c of the S-S′-S junction as a function of thickness and temperature is also studied. Predictions are compared to experimental data in such quasi-2D systems as T_aS₂(pyridine).