| article html file updated | 7 February 2020 09:09 CET | Update | https://www.mdpi.com/2077-0472/6/2/21 |
| article html file updated | 21 September 2019 17:42 CEST | Update | - |
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| article html file updated | 27 March 2019 05:31 CET | Update | - |
| article html file updated | 27 June 2016 12:16 CEST | Update | - |
| article html file updated | 23 May 2016 15:03 CEST | Original file | - |
| article xml uploaded. | 23 May 2016 15:02 CEST | Original file | https://www.mdpi.com/2077-0472/6/2/21/xml |
| article pdf uploaded. | 23 May 2016 15:02 CEST | Version of Record | https://www.mdpi.com/2077-0472/6/2/21/pdf |
