[1] S. Banach: Sur les lignes rectifiables et les surfaces dont l'aire est finie. Fund. math., 7, 1925, 225-236. DOI 10.4064/fm-7-1-225-236

[2] M. H. A. Newman: Elements of the topology of plane sets of points. Cambridge 1954. MR 0044820

[3] W. F. Osgood: A Jordan curve of positive area. Transactions of the American Math. Soc., 4, 1903, 107-112. DOI 10.1090/S0002-9947-1903-1500628-5 | MR 1500628

[4] T. Radó: Length and area. New York 1948. MR 0024511

[5] T. Radó P. V. Reichelderfer: Continuous transformations in analysis. Berlin 1955.

[6] S. Saks: Theory of the integral. New York. Zbl 0017.30004