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N. D. Morris; D. Pfeffermann. (1984). A KALMAN FILTER APPROACH TO THE FORECASTING OF MONTHLY TIME SERIES AFFECTED BY Morris Festivals. , 5(4), 255–268. doi:10.1111/j.1467-9892.1984.tb00391.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research