The Shape of Elementary Trees and Scope Possibilities in STAG Robert Frank author Dennis Ryan Storoshenko author 2012-09 text Proceedings of the 11th International Workshop on Tree Adjoining Grammars and Related Formalisms (TAG+11) Giorgio Satta editor Chung-Hye Han editor Paris, France conference publication frank-storoshenko-2012-shape https://aclanthology.org/W12-4627/ 2012-09 232 240