| article html file updated | 7 February 2020 19:54 CET | Update | https://www.mdpi.com/1424-2818/8/4/31 |
| article html file updated | 22 September 2019 13:02 CEST | Update | N/A |
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| article html file updated | 29 December 2016 06:47 CET | Update | N/A |
| article html file updated | 19 December 2016 08:36 CET | Original file | N/A |
| article xml uploaded. | 19 December 2016 08:35 CET | Original file | https://www.mdpi.com/1424-2818/8/4/31/xml |
| article pdf uploaded. | 19 December 2016 08:35 CET | Version of Record | https://www.mdpi.com/1424-2818/8/4/31/pdf |
