Lieven, Elena Department of Developmental and Comparative Psychology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;
Theakston, A. L., & Lieven, E. (2005). The acquisition of auxiliaries BE and HAVE: an elicitation study. Journal of Child Language, 32(3), 587-616. doi:10.1017/S0305000905006872.