| article html file updated | 9 February 2020 13:47 CET | Update | https://www.mdpi.com/2227-7102/8/2/50 |
| article html file updated | 1 May 2019 03:34 CEST | Update | - |
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| article xml uploaded. | 27 April 2018 12:51 CEST | Update | https://www.mdpi.com/2227-7102/8/2/50/xml |
| article pdf uploaded. | 27 April 2018 12:51 CEST | Updated version of record | https://www.mdpi.com/2227-7102/8/2/50/pdf |
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