@article {3923,
	title = {Towards a Methodology for the Systematic Analysis and Design of Efficient Chemical Processes: Part 1. From Unit Operations to Elementary Process Functions},
	journal = {Chemical Engineering and Processing: Process Intensification},
	volume = {47},
	year = {2008},
	pages = {2051{\textendash}2060},
	author = {Freund, Hannsj{\"o}rg and Sundmacher, Kai}
}
