Using Positional Suffix Trees to Perform Agile Tree Kernel Calculation Gustavo Henrique Paetzold author 2015-05 text Proceedings of the 20th Nordic Conference of Computational Linguistics (NODALIDA 2015) Beáta Megyesi editor Linköping University Electronic Press, Sweden Vilnius, Lithuania conference publication henrique-paetzold-2015-using https://aclanthology.org/W15-1835/ 2015-05 269 273