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Martin, S. J.; Bradley, D. D. C.; Lane, P. A.; Mellor, H.; Burn, P. L. . (1999). Linear and nonlinear optical properties of the conjugated polymers PPV and MEH-PPV. Physical Review B, 59(23), 15133–15142. doi:10.1103/PhysRevB.59.15133 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research