| article html file updated | 8 February 2020 19:53 CET | Update | https://www.mdpi.com/2311-5629/3/4/33 |
| article html file updated | 28 September 2019 02:58 CEST | Update | - |
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| article html file updated | 30 October 2017 13:42 CET | Original file | - |
| article xml uploaded. | 30 October 2017 13:41 CET | Original file | https://www.mdpi.com/2311-5629/3/4/33/xml |
| article pdf uploaded. | 30 October 2017 13:41 CET | Version of Record | https://www.mdpi.com/2311-5629/3/4/33/pdf |
