1. Abney, S. (1996). Tagging and partial parsing, in K. Church, S. Young & G. Bloothooft (eds), Corpus-Based Methods in Language and Speech, An ELSNET volume. Kluwer Academic Publishers, Dordrecht, pp. 118–136.
2. Bar-Hillel, Y., Perles, M. & Shamir, E. (1961). On formal properties of simple phrase structure grammars, Zeitschrift für Phonetik, SprachWissenschaft und Kommunicationsforschung
14: 143–172
3. Bar-Hillel, Y., Perles, M. & Shamir, E. Reprinted in Bar-Hillel’s Language and Information — Selected Essays on their Theory and Application, Addison Wesley series in Logic, 1964, pp. 116–150.
4. Bennis, H. (1986). Gaps and Dummies, PhD thesis, Katholieke Hogeschool Tilburg.
5. Billot, S. & Lang, B. (1989). The structure of shared parse forests in ambiguous parsing, 27th
Annual Meeting of the Association for Computational Linguistics,Vancouver, pp. 143–151