Defining Requirements at Different Levels of Abstraction. Bühne, S., Halmans, G., Pohl, K., Weber, M., Kleinwechter, H., & Wierczoch, T. In Maiden, N., Aoyama, M., & Saeki, M., editors, Proceedings of the 12th IEEE International Conference on Requirements Engineering (RE 2004), pages 346–347, Los Alamitos, 2004. IEEE.
bibtex   
@inproceedings{Buhne.2004g,
 author = {B{\"u}hne, Stan and Halmans, G{\"u}nter and Pohl, Klaus and Weber, Matthias and Kleinwechter, Henning and Wierczoch, Thomas},
 title = {Defining Requirements at Different Levels of Abstraction},
 keywords = {sse},
 pages = {346--347},
 publisher = {IEEE},
 editor = {Maiden, Neil and Aoyama, Mikio and Saeki, Motoshi},
 booktitle = {Proceedings of the 12th IEEE International Conference on Requirements Engineering (RE 2004)},
 year = {2004},
 address = {Los Alamitos}
}

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