| article html file updated | 7 February 2020 21:23 CET | Update | https://www.mdpi.com/2075-4418/7/1/4 |
| article html file updated | 4 May 2019 15:29 CEST | Update | - |
| article html file updated | 29 March 2017 10:37 CEST | Update | - |
| article html file updated | 13 January 2017 08:21 CET | Update | - |
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| article xml uploaded. | 13 January 2017 08:19 CET | Original file | https://www.mdpi.com/2075-4418/7/1/4/xml |
| article pdf uploaded. | 13 January 2017 08:19 CET | Version of Record | https://www.mdpi.com/2075-4418/7/1/4/pdf |
