Sargan, J. D.; Bhargava, Alok (1983). "Maximum Likelihood Estimation of Regression Models with First Order Moving Average Errors when the Root Lies on the Unit Circle". Econometrica. 51 (3): 799–820. doi:10.2307/1912159. JSTOR1912159.
Sargan, J. D.; Bhargava, Alok (1983). "Maximum Likelihood Estimation of Regression Models with First Order Moving Average Errors when the Root Lies on the Unit Circle". Econometrica. 51 (3): 799–820. doi:10.2307/1912159. JSTOR1912159.