| article html file updated | 8 February 2020 22:26 CET | Update | https://www.mdpi.com/2227-9032/5/4/90 |
| article html file updated | 28 September 2019 19:28 CEST | Update | - |
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| article html file updated | 1 December 2017 05:43 CET | Update | - |
| article xml uploaded. | 1 December 2017 05:42 CET | Update | https://www.mdpi.com/2227-9032/5/4/90/xml |
| article pdf uploaded. | 1 December 2017 05:42 CET | Updated version of record | https://www.mdpi.com/2227-9032/5/4/90/pdf |
| article html file updated | 28 November 2017 10:26 CET | Original file | - |
| article xml uploaded. | 28 November 2017 10:25 CET | Original file | - |
| article pdf uploaded. | 28 November 2017 10:25 CET | Version of Record | https://www.mdpi.com/2227-9032/5/4/90/pdf-vor |
