Some Results Regarding Tree Homomorphic Feature Structure Grammar and the Empty String Tore Burheim author 1998-03 text Proceedings of the 11th Nordic Conference of Computational Linguistics (NODALIDA 1998) Bente Maegaard editor Center for Sprogteknologi, University of Copenhagen, Denmark Copenhagen, Denmark conference publication burheim-1998-results https://aclanthology.org/W98-1619/ 1998-03 176 185