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Pham Dinh Tuan. (1986). A FREQUENCY DOMAIN APPROACH TO LAGRANGE MULTIPLIER TEST FOR AUTOREGRESSIVE MOVING AVERAGE MODELS. , 7(1), 73–78. doi:10.1111/j.1467-9892.1986.tb00486.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research