| article html file updated | 8 February 2020 04:58 CET | Update | https://www.mdpi.com/2227-7102/7/2/52 |
| article html file updated | 24 September 2019 15:18 CEST | Update | - |
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| article html file updated | 27 October 2017 09:58 CEST | Update | - |
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| article html file updated | 3 May 2017 13:56 CEST | Original file | - |
| article xml uploaded. | 3 May 2017 13:55 CEST | Update | https://www.mdpi.com/2227-7102/7/2/52/xml |
| article pdf uploaded. | 3 May 2017 13:55 CEST | Version of Record | https://www.mdpi.com/2227-7102/7/2/52/pdf |
