Leire Etxeberria Goiuria Sagardui Mendieta Lorea Belategi Modelling Variation in Quality Attributes. 51-59 2007 VaMoS http://www.vamos-workshop.net/proceedings/VaMoS_2007_Proceedings.pdf conf/vamos/2007 db/conf/vamos/vamos2007.html#EtxeberriaMB07