| article html file updated | 6 February 2020 04:49 CET | Update | https://www.mdpi.com/2304-8158/2/4/460 |
| article html file updated | 20 September 2019 01:51 CEST | Update | N/A |
| article html file updated | 7 May 2019 23:29 CEST | Update | N/A |
| article html file updated | 21 March 2019 05:44 CET | Update | N/A |
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| article html file updated | 17 June 2015 13:46 CEST | Original file | N/A |
| article pdf uploaded. | 11 October 2013 16:26 CEST | Version of Record | https://www.mdpi.com/2304-8158/2/4/460/pdf |
