| article html file updated | 9 February 2020 04:35 CET | Update | https://www.mdpi.com/2227-7102/8/1/21 |
| article html file updated | 30 September 2019 06:56 CEST | Update | - |
| article html file updated | 1 May 2019 23:03 CEST | Update | - |
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| article html file updated | 27 March 2018 15:20 CEST | Update | - |
| article html file updated | 27 January 2018 10:11 CET | Original file | - |
| article xml uploaded. | 27 January 2018 10:09 CET | Update | https://www.mdpi.com/2227-7102/8/1/21/xml |
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| article pdf uploaded. | 27 January 2018 10:09 CET | Version of Record | https://www.mdpi.com/2227-7102/8/1/21/pdf |
