| article html file updated | 7 February 2020 06:26 CET | Update | https://www.mdpi.com/1420-3049/21/4/411 |
| article html file updated | 21 September 2019 13:58 CEST | Update | - |
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| article html file updated | 28 April 2016 11:27 CEST | Update | - |
| article html file updated | 25 March 2016 10:49 CET | Original file | - |
| article xml uploaded. | 25 March 2016 10:47 CET | Original file | https://www.mdpi.com/1420-3049/21/4/411/xml |
| article pdf uploaded. | 25 March 2016 10:47 CET | Version of Record | https://www.mdpi.com/1420-3049/21/4/411/pdf |
