| article html file updated | 7 February 2020 06:51 CET | Update | https://www.mdpi.com/2227-7390/4/2/23 |
| article html file updated | 21 September 2019 14:31 CEST | Update | N/A |
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| article html file updated | 6 April 2016 08:52 CEST | Original file | N/A |
| article xml uploaded. | 6 April 2016 08:51 CEST | Original file | https://www.mdpi.com/2227-7390/4/2/23/xml |
| article pdf uploaded. | 6 April 2016 08:51 CEST | Version of Record | https://www.mdpi.com/2227-7390/4/2/23/pdf |
