Administrative rules:
Some information from Norwegian authorities:
What to do when I receive my tax return? (Tax office)
10% Standard Deduction (Tax office)
EURES, European Employment Services (NAV)
Aplication Portal Norway (UDI)
Working in Norway? Employees from EØS/EFTA contries (UDI)
Skal du arbeide i Norge? Arbeidstagere fra EØS/EFTA området.(UDI)
Skatt: Når du er ansatt hos norsk arbeidsgiver (Skatteetaten)
Intern link for students. This can be very informative also for employees: