Thomas Reichel Gudula Rünger Daniel Steger Flexible Workflows for an Energy-Oriented Product Development Process. 243-254 2010 ISSS/BPSC conf/bpsc/2010 db/conf/bpsc/bpsc2010.html#ReichelRS10 http://subs.emis.de/LNI/Proceedings/Proceedings177/article6189.html