| article html file updated | 9 February 2020 11:11 CET | Update | https://www.mdpi.com/2076-3921/7/4/47 |
| article html file updated | 1 October 2019 23:01 CEST | Update | N/A |
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| article html file updated | 25 March 2018 09:46 CEST | Original file | N/A |
| article xml uploaded. | 25 March 2018 09:45 CEST | Original file | https://www.mdpi.com/2076-3921/7/4/47/xml |
| article pdf uploaded. | 25 March 2018 09:45 CEST | Version of Record | https://www.mdpi.com/2076-3921/7/4/47/pdf |