| article html file updated | 7 February 2020 22:42 CET | Update | https://www.mdpi.com/2220-9964/6/2/37 |
| article html file updated | 23 September 2019 04:08 CEST | Update | N/A |
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| article html file updated | 1 March 2017 03:44 CET | Update | N/A |
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| article pdf uploaded. | 5 February 2017 08:44 CET | Version of Record | https://www.mdpi.com/2220-9964/6/2/37/pdf |
