| article html file updated | 7 February 2020 06:04 CET | Update | https://www.mdpi.com/2077-0375/6/1/20 |
| article html file updated | 5 May 2019 21:05 CEST | Update | N/A |
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| article html file updated | 30 March 2016 08:00 CEST | Original file | N/A |
| article xml uploaded. | 22 March 2016 03:32 CET | Update | https://www.mdpi.com/2077-0375/6/1/20/xml |
| article pdf uploaded. | 22 March 2016 03:32 CET | Updated version of record | https://www.mdpi.com/2077-0375/6/1/20/pdf |
| article pdf uploaded. | 18 March 2016 08:50 CET | Version of Record | https://www.mdpi.com/2077-0375/6/1/20/pdf-vor |
