| article html file updated | 7 February 2020 23:09 CET | Update | https://www.mdpi.com/2077-1444/8/2/21 |
| article html file updated | 23 September 2019 06:37 CEST | Update | - |
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| article html file updated | 1 March 2017 11:08 CET | Update | - |
| article html file updated | 10 February 2017 16:40 CET | Original file | - |
| article xml uploaded. | 10 February 2017 16:39 CET | Original file | https://www.mdpi.com/2077-1444/8/2/21/xml |
| article pdf uploaded. | 10 February 2017 16:39 CET | Version of Record | https://www.mdpi.com/2077-1444/8/2/21/pdf |
