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Paul D. Feigin; Richard L. Tweedie. (1985). RANDOM COEFFICIENT AUTOREGRESSIVE PROCESSES:A MARKOV CHAIN ANALYSIS OF STATIONARITY AND FINITENESS OF MOMENTS. , 6(1), 1–14. doi:10.1111/j.1467-9892.1985.tb00394.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research