| article html file updated | 6 February 2020 19:48 CET | Update | https://www.mdpi.com/2311-553X/1/1/87 |
| article html file updated | 20 September 2019 22:59 CEST | Update | N/A |
| article html file updated | 6 May 2019 17:32 CEST | Update | N/A |
| article html file updated | 26 March 2019 04:57 CET | Update | N/A |
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| article html file updated | 21 August 2015 13:46 CEST | Original file | N/A |
| article pdf uploaded. | 17 June 2015 15:49 CEST | Version of Record | https://www.mdpi.com/2311-553X/1/1/87/pdf |
