4Bore, H & Wexler, К. 1987. The maturation of syntax[A]. In Roeper, T. & Williams, E (eds.). Parameter Setting[C]. Dordrecht: Foris, 123- 72.
5Clahsen,H., Penke, M. & Parodi, T. 1994. Functional catego ries in early child German[J]. Language Acquisition 3, 395- 429.
6Dulay,H & Burt, M. 1974. Natural sequences in child second language acquisition[J]. Language Learning 24, 37-53.
7Eubank, L. 1993/1994. On the transfer of parametric values in L2 development[J]. Language Acquisition 3, 182 -208.
8Eubank, L. 1996. Negation in early German-English interlanguage: more Valueless Features in the 12 initial state [J].Seoond Language Research 12, 73-106.
9Hyams,N. 1983. The genesis of clausal structure[A]. In Meisel, J. (edl.). The Acquisiton of Verb Placement[C].Dordrecht: Кluwer, 371 - 400.
10Papp, S. 2000. Stable and developmental optionality in native and non - native Hungarian grammars[J]. Second Language Research 16,173 - 200.
