| article html file updated | 7 February 2020 07:05 CET | Update | https://www.mdpi.com/2220-9964/5/4/49 |
| article html file updated | 5 May 2019 19:00 CEST | Update | N/A |
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| article pdf uploaded. | 12 April 2016 13:27 CEST | Updated version of record | https://www.mdpi.com/2220-9964/5/4/49/pdf |
| article html file updated | 11 April 2016 08:02 CEST | Original file | N/A |
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| article pdf uploaded. | 11 April 2016 08:01 CEST | Version of Record | https://www.mdpi.com/2220-9964/5/4/49/pdf-vor |