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Pham Dinh Tuan. (1984). A NOTE ON SOME STATISTICS USEFUL IN IDENTIFYING THE ORDER OF AUTOREGRESSIVE MOVING AVERAGE MODEL. , 5(4), 273–279. doi:10.1111/j.1467-9892.1984.tb00393.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research