Park, Jungkyu, Ramsey Cardwell, and Hsiu-Ting Yu. “Specifying the Random Effect Structure in Linear Mixed Effect Models for Analyzing Psycholinguistic Data”. Methodology 16, no. 2 (June 18, 2020): 92-111. Accessed August 11, 2020. https://meth.psychopen.eu/index.php/meth/article/view/2809.