Hong Linh Truong Enrico Morten Michal Laclavik Thomas Burkhart Martin Carpenter Christoph Dorn Panagiotis Gkouvas Kalaboukas Konstantinos Dario Luiz Lopez César A. Marín Christian Melchiorre Ana Pinuela Martin Seleng Dirk Werth Email-based Interoperability Service Utilities for Cooperative Small and Medium Enterprises. 95-101 2009 ICEIS (4) conf/iceis/2009-4 db/conf/iceis/iceis2009-4.html#TruongMLBCDGKLMMPSW09