As a FLOW graduate student , you can purchase books that are relevant for your PhD studies up to a maximum of 2000 Kr per year.
If your payment method is an "invoice" (a.k.a. faktura), then use the
electronic invoice system (agresso). If your payment method is
private (for example your private credit card) then report your
payment with the document (download here) together with the receipt to Heide Hornk.