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Chomsky, N. (1986). Barriers (Cambridge, MA: MIT Press).

Grimshaw, J. & Rosen, S. (1990). Knowledge and obedience the developmental state of the binding theory. Linguistic Inquiry, 21.

Hamburger, H. , & Cram, S. (1982) Relative acquisition. In S. Kuczaj (ed.), Language Development Vol. 2 (Hillsdale, NJ Erlbaum ).

Hyams, N. (1986) Language Acquisition and the Theory of Parameters (Dordrecht: Reidel).

Lightfoot, D. (1989). The child's trigger experience Degree Zero Learnability . Behavioural and Brain Sciences, 12 (2).

Tavakolian, S. (1981): Language Acquisition and Linguistic Theory (Cambridge, MA MIT Press).