Anis Charfi Benjamin Schmeling Mira Mezini Transactional BPEL Processes with AO4BPEL Aspects. 149-158 2007 ECOWS http://doi.ieeecomputersociety.org/10.1109/ECOWS.2007.29 conf/ecows/2007 db/conf/ecows/ecows2007.html#CharfiSM07