| article html file updated | 7 February 2020 20:28 CET | Update | https://www.mdpi.com/2076-3921/6/1/2 |
| article html file updated | 22 September 2019 16:05 CEST | Update | - |
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| article html file updated | 29 December 2016 14:10 CET | Update | - |
| article xml uploaded. | 29 December 2016 14:09 CET | Update | https://www.mdpi.com/2076-3921/6/1/2/xml |
| article pdf uploaded. | 29 December 2016 14:09 CET | Updated version of record | https://www.mdpi.com/2076-3921/6/1/2/pdf |
| article html file updated | 29 December 2016 03:51 CET | Original file | - |
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| article pdf uploaded. | 29 December 2016 03:50 CET | Version of Record | https://www.mdpi.com/2076-3921/6/1/2/pdf-vor |
