Levelt, Willem J. M. Language Production Group Levelt, MPI for Psycholinguistics, Max Planck Society;
levelt_1982_surface.pdf (Publisher version), 2MB
Levelt, W. J. M., & Kelter, S. (1982). Surface form and memory in question answering. Cognitive Psychology, 14, 78-106. doi:10.1016/0010-0285(82)90005-6.