M. Sanguinetti, C. Bosco, and L. Lesmo. DepLing, page 282-291. MATFYZPRESS Publishing House of the Faculty of Mathematics and Physics Charles University in Prague / ACL, (2013)
B. Eugenio, L. Lesmo, P. Pogliano, P. Torasso, and F. Urbano. COLING, page 344-346. Institut für angewandte Kommunikations- und Sprachforschung e.V. (IKS), Poppelsdorfer Allee 47, Bonn, Germany, (1986)