Cook, S. (2008). Joint maximum likelihood estimation of unit root testing equations and GARCH processes: Some finite-sample issues. Mathematics and Computers in Simulation, 77(1), pp. 109-116. doi:10.1016/j.matcom.2007.02.009

Cook, Steve. "Joint Maximum Likelihood Estimation of Unit Root Testing Equations and GARCH Processes: Some Finite-sample Issues." Mathematics and Computers in Simulation 77, no. 1 (2008): 109-116.

Cook, Steve. "Joint Maximum Likelihood Estimation of Unit Root Testing Equations and GARCH Processes: Some Finite-sample Issues." Mathematics and Computers in Simulation 77.1 (2008): 109-116.