| article html file updated | 7 February 2020 20:10 CET | Update | https://www.mdpi.com/1999-4907/8/1/6 |
| article html file updated | 22 September 2019 14:24 CEST | Update | N/A |
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| article html file updated | 8 February 2017 10:12 CET | Update | N/A |
| article html file updated | 22 December 2016 13:31 CET | Original file | N/A |
| article xml uploaded. | 22 December 2016 13:30 CET | Original file | https://www.mdpi.com/1999-4907/8/1/6/xml |
| article pdf uploaded. | 22 December 2016 13:30 CET | Version of Record | https://www.mdpi.com/1999-4907/8/1/6/pdf |
