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Economic activity analysis
Morgenstern, Oskar, (1954)
Linear programming : methods and applications
Gass, Saul I., (1964)
Linear programming : an explanation of the simplex algorithm
Greenwald, Dakota Ulrich, (1957)
Bidragsmetoden og nøglefaktorerne
Nielsen, Niels, (1955)
Tale ved Mindehøjtideligheden i Horsens for Vitus Bering
Nielsen, Niels, (1942)
Traek af vor nuvaerende Viden ou Landets Natur
Nielsen, Niels, (1941)