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2. “The Measure of Product and Cylinder Sets,”;Besicovitch;J. London Math. Soc.,1945
3. “Surface Area I, II,”;Federer;Trans. Am. Math. Soc.,1944
4. “Carathéodory Measure of Cylinders,”;Freilich;Trans. Am. Math. Soc.,1966
5. “Über Flächenmass von Punktmengen,”;Gross;Monatshefte für Mathematik und Physik,1918