Extreme Programming at Work. - Walter Ambu; Fabrizio Gianneschi (XP, 2003)

Requirements of an ISO Compliant XP Tool. - Marco Melis; Walter Ambu; Sandro Pinna; Katiuscia Mannaro (XP, 2004)

Studying the Evolution of Quality Metrics in an Agile/Distributed Project. - Walter Ambu; Giulio Concas; Michele Marchesi; Sandro Pinna (XP, 2006)