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"Axioms for multilevel objects."
A. Bergstra et al. (1980)
- A. Bergstra, H. J. M. Goeman, Alexander Ollongren, G. A. Terpstra, Theo P. van der Weide:
Axioms for multilevel objects. Fundam. Informaticae 3(2): 171-180 (1980)
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