1. Abney, S.P.: Stochastic attribute-value grammars. Computational Linguistics 23(4), 597–618 (1997)
2. Bates, E., MacWhinney, B.: Competition, variation, and language learning. In: MacWhinney, B. (ed.) Mechanisms of language acquisition, ch. 6, pp. 157–193. Lawrence Erlbaum Associates, Hillsdale (1987)
3. Bender, E.M., Flickinger, D., Fouvry, F., Siegel, M.: Shared representation in multilingual grammar engineering. Research on Language and Computation 3, 131–138 (2005)
4. Trends in Language Acquisition Research;R.A. Berman,2004
5. Bertolo, S.: Acquisition, formal theories of. In: Wilson, R.A., Keil, F.C. (eds.) The MIT Encyclopedia of the Cognitive Sciences. Bradford Books (September 2001)