| article html file updated | 8 February 2020 02:47 CET | Update | https://www.mdpi.com/2224-2708/6/2/4 |
| article html file updated | 24 September 2019 03:18 CEST | Update | - |
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| article html file updated | 29 June 2017 11:33 CEST | Update | - |
| article html file updated | 1 April 2017 13:34 CEST | Original file | - |
| article xml uploaded. | 1 April 2017 13:33 CEST | Original file | https://www.mdpi.com/2224-2708/6/2/4/xml |
| article pdf uploaded. | 1 April 2017 13:33 CEST | Version of Record | https://www.mdpi.com/2224-2708/6/2/4/pdf |
