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Adding oppositely charged co-surfactant to spherical micelles of an ionic surfactant may induce the transition to long wormlike micelles. Viscoelastic solutions of wormlike micelles find successful application in many industrial and technological fields, including oil and gas production. In the present work we investigate viscoelastic properties of mixed micelles comprised of an anionic surfactant (potassium oleate) and different cationic co-surfactants.