| article html file updated | 6 February 2020 16:34 CET | Update | https://www.mdpi.com/2304-8158/4/1/34 |
| article html file updated | 20 September 2019 18:47 CEST | Update | - |
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| article html file updated | 21 August 2015 08:43 CEST | Original file | - |
| article pdf uploaded. | 13 March 2015 10:13 CET | Updated version of record | https://www.mdpi.com/2304-8158/4/1/34/pdf |
| article pdf uploaded. | 12 March 2015 14:21 CET | Version of Record | https://www.mdpi.com/2304-8158/4/1/34/pdf-vor |
