| article html file updated | 8 February 2020 23:18 CET | Update | https://www.mdpi.com/2076-3271/5/4/31 |
| article html file updated | 29 September 2019 00:42 CEST | Update | - |
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| article html file updated | 6 December 2017 11:21 CET | Original file | - |
| article xml uploaded. | 6 December 2017 11:19 CET | Original file | https://www.mdpi.com/2076-3271/5/4/31/xml |
| article pdf uploaded. | 6 December 2017 11:19 CET | Version of Record | https://www.mdpi.com/2076-3271/5/4/31/pdf |
