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JUCS - Journal of Universal Computer Science 23(9): 808-844
doi:
10.3217/jucs-023-09-0808
Received:
03 May 2017 | Approved:
26 Sep 2017 | Published:
28 Sep 2017
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Author
Mario Bravetti 
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University of Bologna and FOCUS, INRIA, Bologna, Italy
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Conflict of interest
The author has declared that no competing interests exist.
This article is freely available under the J.UCS Open Content License.