Jansen, T., C. Vögelin, N. Machts, S. D. Keller, and J. Möller. “Don’t Just Judge the Spelling! The Influence of Spelling on Assessing Second-Language Student Essays”. Frontline Learning Research, vol. 9, no. 1, Feb. 2021, pp. 44 -65, doi:10.14786/flr.v9i1.541.