@misc{weber85,
	title = {{Specification of Modular Systems}},
	author = {Herbert Weber and Hartmut Ehrig},
	howpublished = {University of Dortmund, Report 198},
	year = {1985},
	biburl = {http://www.bibsonomy.org/bibtex/2f573c13be4e303d06863be3146384f3e/charoy},
	keywords = {ADT }
}