== Abstract ==

​

​

​

​

== Original document ==

​

The different versions of the original document can be found in:

​

* [http://dx.doi.org/10.2991/emcs-17.2017.136 http://dx.doi.org/10.2991/emcs-17.2017.136] under the license https://creativecommons.org/licenses/by-nc

​

* [https://download.atlantis-press.com/article/25876132.pdf https://download.atlantis-press.com/article/25876132.pdf]

​

* [https://www.atlantis-press.com/proceedings/emcs-17/25876132 https://www.atlantis-press.com/proceedings/emcs-17/25876132],

: [https://academic.microsoft.com/#/detail/2619834759 https://academic.microsoft.com/#/detail/2619834759] under the license cc-by-nc

​