| article html file updated | 9 February 2020 04:05 CET | Update | https://www.mdpi.com/2227-7072/6/1/12 |
| article html file updated | 30 September 2019 04:01 CEST | Update | - |
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| article html file updated | 26 March 2018 15:41 CEST | Update | - |
| article html file updated | 23 January 2018 18:05 CET | Original file | - |
| article xml uploaded. | 23 January 2018 18:04 CET | Original file | https://www.mdpi.com/2227-7072/6/1/12/xml |
| article pdf uploaded. | 23 January 2018 18:04 CET | Version of Record | https://www.mdpi.com/2227-7072/6/1/12/pdf |
