| article html file updated | 7 February 2020 07:11 CET | Update | https://www.mdpi.com/2073-4360/8/4/139 |
| article html file updated | 21 September 2019 15:02 CEST | Update | - |
| article html file updated | 5 May 2019 18:47 CEST | Update | - |
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| article html file updated | 29 April 2016 09:56 CEST | Update | - |
| article html file updated | 13 April 2016 09:09 CEST | Original file | - |
| article xml uploaded. | 13 April 2016 09:07 CEST | Original file | https://www.mdpi.com/2073-4360/8/4/139/xml |
| article pdf uploaded. | 13 April 2016 09:07 CEST | Version of Record | https://www.mdpi.com/2073-4360/8/4/139/pdf |
