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C. Bolz, L. Diekmann, and L. Tratt. Proceedings of the 2013 ACM SIGPLAN International Conference on Object Oriented Programming Systems Languages & Applications, page 167--182. ACM, (2013)
C. Wimmer, S. Brunthaler, P. Larsen, and M. Franz. Proceedings of the 11th Annual International Conference on Aspect-oriented Software Development, page 203--214. New York, NY, USA, ACM, (2012)
C. Bolz, M. Leuschel, and D. Schneider. Proceedings of the 12th International ACM SIGPLAN Symposium on Principles and Practice of Declarative Programming, page 99--108. ACM, (2010)
M. Golm, and J. Kleinöder. Meta-Level Architectures and Reflection, volume 1616 of Lecture Notes in Computer Science, Springer Berlin Heidelberg, (1999)