| article html file updated | 7 February 2020 21:49 CET | Update | https://www.mdpi.com/2311-5629/3/1/4 |
| article html file updated | 22 September 2019 23:17 CEST | Update | - |
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| article html file updated | 19 January 2017 12:19 CET | Original file | - |
| article xml uploaded. | 19 January 2017 12:17 CET | Original file | https://www.mdpi.com/2311-5629/3/1/4/xml |
| article pdf uploaded. | 19 January 2017 12:17 CET | Version of Record | https://www.mdpi.com/2311-5629/3/1/4/pdf |
