| article html file updated | 6 February 2020 04:41 CET | Update | https://www.mdpi.com/2304-8158/2/4/444 |
| article html file updated | 7 May 2019 23:47 CEST | Update | N/A |
| article html file updated | 21 March 2019 05:22 CET | Update | N/A |
| article html file updated | 10 February 2017 03:42 CET | Update | N/A |
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| article html file updated | 14 August 2014 11:41 CEST | Update | N/A |
| article xml file uploaded | 14 August 2014 11:41 CEST | Update | https://www.mdpi.com/2304-8158/2/4/444/xml |
| article html file updated | 14 August 2014 11:21 CEST | Original file | N/A |
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| article pdf uploaded. | 8 October 2013 11:26 CEST | Updated version of record | https://www.mdpi.com/2304-8158/2/4/444/pdf |
| article pdf uploaded. | 30 September 2013 17:40 CEST | Version of Record | https://www.mdpi.com/2304-8158/2/4/444/pdf-vor |
