Working Group "Benefits and Risks of Exotic Biological Control Agents" : Proceedings of the fourth meeting at / à Ponta Delgada, Azores (Portugal), September 12 - 14, 2018. Editor Danny Haelewaters, Jana Collatz. [S. l.] : [s. n.], 2019. IX + 76 p. IOBC-WPRS Bulletin, Vol. 145, 2019. ISBN 978-92-9067-330-9