| article html file updated | 9 February 2020 12:15 CET | Update | https://www.mdpi.com/2227-7390/6/4/50 |
| article html file updated | 2 October 2019 05:21 CEST | Update | N/A |
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| article html file updated | 17 April 2019 06:42 CEST | Update | N/A |
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| article html file updated | 3 April 2018 13:18 CEST | Update | N/A |
| article html file updated | 2 April 2018 23:51 CEST | Original file | N/A |
| article xml uploaded. | 2 April 2018 13:56 CEST | Original file | https://www.mdpi.com/2227-7390/6/4/50/xml |
| article pdf uploaded. | 2 April 2018 13:56 CEST | Version of Record | https://www.mdpi.com/2227-7390/6/4/50/pdf |
