| article html file updated | 6 February 2020 17:57 CET | Update | https://www.mdpi.com/2227-7390/3/2/273 |
| article html file updated | 20 September 2019 20:32 CEST | Update | N/A |
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| article html file updated | 26 March 2019 01:11 CET | Update | N/A |
| article html file updated | 21 August 2015 11:00 CEST | Update | N/A |
| article html file updated | 24 July 2015 08:40 CEST | Original file | N/A |
| article xml file uploaded | 24 July 2015 08:40 CEST | Original file | https://www.mdpi.com/2227-7390/3/2/273/xml |
| article pdf uploaded. | 22 April 2015 15:48 CEST | Version of Record | https://www.mdpi.com/2227-7390/3/2/273/pdf |
