| article html file updated | 9 February 2020 07:33 CET | Update | https://www.mdpi.com/2224-2708/7/1/9 |
| article html file updated | 1 May 2019 16:29 CEST | Update | - |
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| article html file updated | 27 March 2018 12:43 CEST | Update | - |
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| article xml uploaded. | 1 March 2018 09:21 CET | Update | https://www.mdpi.com/2224-2708/7/1/9/xml |
| article pdf uploaded. | 1 March 2018 09:21 CET | Updated version of record | https://www.mdpi.com/2224-2708/7/1/9/pdf |
| article html file updated | 25 February 2018 05:02 CET | Original file | - |
| article xml uploaded. | 25 February 2018 05:01 CET | Original file | - |
| article pdf uploaded. | 25 February 2018 05:01 CET | Version of Record | https://www.mdpi.com/2224-2708/7/1/9/pdf-vor |
