Lehtonen, Veli-Matti2021-03-192024-03-062021-03-192024-03-061979951-46-4440-9https://otos.stat.fi/handle/123456789/84660encc by 4.0tilastothinnatindeksitURN:ISBN:951-46-4440-9metadataOnlyfalseTutkimuksia, Working Papers