| article html file updated | 9 February 2020 06:18 CET | Update | https://www.mdpi.com/2227-7072/6/1/21 |
| article html file updated | 30 September 2019 17:26 CEST | Update | - |
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| article html file updated | 26 March 2018 15:44 CEST | Update | - |
| article html file updated | 22 February 2018 10:22 CET | Update | - |
| article xml uploaded. | 22 February 2018 10:20 CET | Update | https://www.mdpi.com/2227-7072/6/1/21/xml |
| article pdf uploaded. | 22 February 2018 10:20 CET | Updated version of record | https://www.mdpi.com/2227-7072/6/1/21/pdf |
| article html file updated | 13 February 2018 14:03 CET | Update | - |
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| article pdf uploaded. | 13 February 2018 14:02 CET | Updated version of record | https://www.mdpi.com/2227-7072/6/1/21/pdf-vor |
| article html file updated | 11 February 2018 11:26 CET | Original file | - |
| article xml uploaded. | 11 February 2018 11:24 CET | Original file | - |
| article pdf uploaded. | 11 February 2018 11:24 CET | Version of Record | https://www.mdpi.com/2227-7072/6/1/21/pdf-vor |
