| article html file updated | 5 February 2020 09:32 CET | Update | https://www.mdpi.com/1422-0067/8/4/304 |
| article html file updated | 9 May 2019 17:03 CEST | Update | N/A |
| article html file updated | 19 March 2019 12:33 CET | Update | N/A |
| article html file updated | 19 June 2013 12:14 CEST | Original file | N/A |
| article xml file uploaded | 19 June 2013 12:13 CEST | Original file | https://www.mdpi.com/1422-0067/8/4/304/xml |
