| article html file updated | 7 February 2020 23:01 CET | Update | https://www.mdpi.com/2304-8158/6/2/12 |
| article html file updated | 23 September 2019 05:57 CEST | Update | - |
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| article html file updated | 2 March 2017 10:21 CET | Update | - |
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| article xml uploaded. | 13 February 2017 06:46 CET | Original file | https://www.mdpi.com/2304-8158/6/2/12/xml |
| article pdf uploaded. | 13 February 2017 06:46 CET | Updated version of record | https://www.mdpi.com/2304-8158/6/2/12/pdf |
| article pdf uploaded. | 10 February 2017 04:15 CET | Version of Record | https://www.mdpi.com/2304-8158/6/2/12/pdf-vor |
