Show 15 5 10 15 20 50 100 250 Sort by year (new to old) Actions Download search results Subscribe to news feed Your filters: cql: parent exact "QUADERNI DEL SEMINARIO MATEMATICO DI BRESCIA" Add to list Journal Article A4 Halfordered chain structures B Alvoni, H Karzel and Cristina Tonesi (UGent) (1999) QUADERNI DEL SEMINARIO MATEMATICO DI BRESCIA. 18.