Sheet music

 National Library of Norway, with work list:

 https://www.nb.no/sheet-music/shop/?_search=bj%C3%B8rn%20Breimo

IMSLP: 

https://imslp.org/wiki/Category:Breimo,_Bj%C3%B8rn

Sheet Music Plus:

https://www.sheetmusicplus.com/en/category/arrangeme/778/bjorn-breimo/