1. Austin, J.L.: How to do things with words. Oxford University Press, Oxford (1962)
2. Ballmer, T.T., Brennenstuhl, W.: Speech act classification: A study of the lexical analysis of English speech activity verbs. Springer, Berlin (1981)
3. Baniassad, E., Clarke, S.: Theme: an approach for aspect-oriented analysis and design. In: 26th International Conference on Software Engineering (ICSE 2004), pp. 158–167. IEEE Computer Society Press, Los Alamitos (2004)
4. Brown, J., Cooper, C., Pidd, M.: A taxing problem: the complementary use of hard and soft OR in the public sector. Eur. J. Oper. Res. 172(2), 666–679 (2006)
5. Bubenko, J.A., Brash, D., Stirna, J.: EKD User Guide. Dept. of Computer and Systems Science tech. report, Stockholm University (1998)