@conference {cGiro-i-Nieto06b, title = {From Partition Trees to Semantic Trees}, booktitle = {2ndas Jornades UPC de Investigaci{\'o}n en Autom{\'a}tica, Visi{\'o}n y Rob{\'o}tica}, year = {2006}, pages = {187{\textendash}194}, isbn = {84-7653-885-5}, author = {Xavier Gir{\'o}-i-Nieto and Marqu{\'e}s, F.} }