1. ABB (2000) Environmental Product Declaration: Distribution transformer 315kVA
2. ABB (2003) Environmental Product Declaration: Large Distribution Transformer 16/20 MVA (ONAN/ONAF)
3. ABB Denmark (2002) Power IT Compact Secondary Substations (CSS): Technical catalogue for concrete substations
4. ABB Poland (2012) ABB in Poland. http://smart.eestec.pl/abbinpoland.pdf , accessed 19-04-2013
5. Agency IE (2010) Electr Inform. doi: 10.1016/0301-4215(90)90225-S