| article html file updated | 6 February 2020 04:49 CET | Update | https://www.mdpi.com/2218-1989/3/4/912 |
| article html file updated | 7 May 2019 23:28 CEST | Update | - |
| article html file updated | 21 March 2019 05:46 CET | Update | - |
| article html file updated | 17 June 2015 13:47 CEST | Update | - |
| article html file updated | 18 March 2014 09:53 CET | Original file | - |
| article xml file uploaded | 18 March 2014 09:53 CET | Original file | https://www.mdpi.com/2218-1989/3/4/912/xml |
| article pdf uploaded. | 11 October 2013 17:11 CEST | Version of Record | https://www.mdpi.com/2218-1989/3/4/912/pdf |
