https://www.imd.org/research-knowledge/articles/the-four-tiers-of-conflict-of-interest-faced-by-board-directors/ https://books.google.com.co/books?id=iCfZDwAAQBAJ&pg=PA120&lpg=PA120&dq=conflict+of+interest+four+tiers&source=bl&ots=-gtTlFaSzM&sig=ACfU3U1H26-InO6X4bHSG4n1DNay2jbVRw&hl=en&sa=X&ved=2ahUKEwiz5urQ34vqAhXoQ98KHbdFB6AQ6AEwF3oECA4QAQ#v=onepage&q=conflict%20of%20interest%20four%20tiers&f=false
https://www.nordea.com/Images/33-235036/nordea-conflict-of-interest-policy-en.pdf