| article html file updated | 9 February 2020 00:04 CET | Update | https://www.mdpi.com/2227-7390/5/4/81 |
| article html file updated | 29 September 2019 05:06 CEST | Update | - |
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| article html file updated | 14 December 2017 08:52 CET | Original file | - |
| article xml uploaded. | 14 December 2017 08:51 CET | Original file | https://www.mdpi.com/2227-7390/5/4/81/xml |
| article pdf uploaded. | 14 December 2017 08:51 CET | Version of Record | https://www.mdpi.com/2227-7390/5/4/81/pdf |
