Klein, Wolfgang Language Acquisition Group, MPI for Psycholinguistics, Max Planck Society;
1992whynotgramm.pdf (Any fulltext), 88KB
Perdue, C., & Klein, W. (1992). Why does the production of some learners not grammaticalize? Studies in Second Language Acquisition, 14, 259-272. doi:10.1017/S0272263100011116.