| article html file updated | 9 February 2020 08:14 CET | Update | https://www.mdpi.com/2227-7102/8/1/31 |
| article html file updated | 1 October 2019 04:32 CEST | Update | - |
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| article html file updated | 27 March 2018 15:21 CEST | Update | - |
| article html file updated | 1 March 2018 09:50 CET | Original file | - |
| article xml uploaded. | 1 March 2018 09:48 CET | Original file | https://www.mdpi.com/2227-7102/8/1/31/xml |
| article pdf uploaded. | 1 March 2018 09:48 CET | Version of Record | https://www.mdpi.com/2227-7102/8/1/31/pdf |
