| article html file updated | 7 February 2020 23:42 CET | Update | https://www.mdpi.com/2220-9964/6/2/51 |
| article html file updated | 23 September 2019 09:41 CEST | Update | - |
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| article html file updated | 1 March 2017 03:52 CET | Update | - |
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| article xml uploaded. | 18 February 2017 05:11 CET | Original file | https://www.mdpi.com/2220-9964/6/2/51/xml |
| article pdf uploaded. | 18 February 2017 05:11 CET | Version of Record | https://www.mdpi.com/2220-9964/6/2/51/pdf |
