| article html file updated | 7 February 2020 13:42 CET | Update | https://www.mdpi.com/2077-0472/6/3/39 |
| article html file updated | 5 May 2019 06:26 CEST | Update | - |
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| article html file updated | 29 September 2016 08:25 CEST | Update | - |
| article html file updated | 22 August 2016 13:32 CEST | Original file | - |
| article xml uploaded. | 22 August 2016 13:31 CEST | Original file | https://www.mdpi.com/2077-0472/6/3/39/xml |
| article pdf uploaded. | 22 August 2016 13:31 CEST | Version of Record | https://www.mdpi.com/2077-0472/6/3/39/pdf |
