| article html file updated | 8 February 2020 10:32 CET | Update | https://www.mdpi.com/2073-4409/6/3/21 |
| article html file updated | 25 September 2019 20:17 CEST | Update | N/A |
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| article xml uploaded. | 14 July 2017 11:49 CEST | Update | https://www.mdpi.com/2073-4409/6/3/21/xml |
| article pdf uploaded. | 14 July 2017 11:49 CEST | Updated version of record | https://www.mdpi.com/2073-4409/6/3/21/pdf |
| article html file updated | 9 July 2017 08:37 CEST | Original file | N/A |
| article pdf uploaded. | 9 July 2017 08:36 CEST | Version of Record | https://www.mdpi.com/2073-4409/6/3/21/pdf-vor |