| article html file updated | 7 February 2020 15:46 CET | Update | https://www.mdpi.com/2076-3425/6/4/45 |
| article html file updated | 22 September 2019 01:59 CEST | Update | - |
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| article html file updated | 27 December 2016 02:17 CET | Update | - |
| article html file updated | 29 September 2016 10:52 CEST | Original file | - |
| article xml uploaded. | 29 September 2016 10:50 CEST | Original file | https://www.mdpi.com/2076-3425/6/4/45/xml |
| article pdf uploaded. | 29 September 2016 10:50 CEST | Version of Record | https://www.mdpi.com/2076-3425/6/4/45/pdf |
