1. ABB 2013, ABB Review 2/2013, Mine of information, Available from www.abb.com/abbreview
2. ABB 2014, Mine location intelligence, Available from http://wwwO5.abb.com/global/scot/scot244.nsf/veritydisplay/84034bab92ef5cfecl257ced004a6294/$file/ABB_Fl yer_MLI_HR.pdf
3. AeroScout 2014a, Available from http://www.aeroscout.com/industrial/
4. AeroScout 2014b, Mobileview, Available from http://www.aeroscout.com/mobileview
5. Atlas Copco 2009, Scooptram automation, Available from www.atlascopco.co.uk/images/scooptramautomationfolderv7_tcm7951543703.pdf