1.
Dybdahl V. Kjeld Bjerke & Niels Ussing: Studier over Danmarks national produkt 1870-1950. (Gad, 1958). 175 s. hi [Internet]. 1961 Jan. 1 [cited 2024 Jul. 18];5. Available from: https://tidsskrift.dk/historiejyskesamling/article/view/37367