• [1] Lamberto Cesari, Caratterizzazione analitica delle superficie continue di area finita secondo Lebesgue, Ann. Scuola Norm. Super. Pisa (2) 11 (1942), 1–42 (Italian). MR 0018213
• [2] Lamberto Cesari, On the representation of surfaces, Amer. J. Math. 72 (1950), 335–346. MR 0034450, https://doi.org/10.2307/2372037
• [3] Herbert Federer, Surface area. II, Trans. Amer. Math. Soc. 55 (1944), 438–456. MR 0010611, https://doi.org/10.1090/S0002-9947-1944-0010611-3
• [4] Herbert Federer, Measure and area, Bull. Amer. Math. Soc. 58 (1952), 306–378. MR 0049289, https://doi.org/10.1090/S0002-9904-1952-09586-0
• [5] Earl J. Mickle, Lebesgue area and Hausdorff measure, Rend. Circ. Mat. Palermo (2) 4 (1955), 205–218. MR 0074497, https://doi.org/10.1007/BF02849295
• [6] Tibor Radó, Length and Area, American Mathematical Society Colloquium Publications, vol. 30, American Mathematical Society, New York, 1948. MR 0024511
• [7] Tibor Radó, Two-dimensional concepts of bounded variation and absolute continuity, Duke Math. J. 14 (1947), 587–608. MR 0022593
• [8] Tibor Radó, On essentially absolutely continuous plane transformations, Bull. Amer. Math. Soc. 55 (1949), 629–632. MR 0029975, https://doi.org/10.1090/S0002-9904-1949-09267-4
• [9] Tibor Radó, On multiplicity functions associated with Lebesgue area, Rend. Circ. Mat. Palermo (2) 4 (1955), 219–236. MR 0074498, https://doi.org/10.1007/BF02849296
• [10] J. W. T. Youngs, A reduction theorem concerning the representation problem for Fréchet varieties, Proc. Nat. Acad. Sci. U. S. A. 32 (1946), 328–330. MR 0018219

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L. Cesari, Caratterizzazione analitica delle superficie continue di area finita secondo Lebesgue, Annali della R. Scuola Normale Superiore di Pisa (2) vol. 10 (1941) pp. 253-294 and vol. 11 (1942) pp. 1-42. MR 0018213 (8:257i)

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H. Federer, Surface area. II, Trans. Amer. Math. Soc. vol. 55 (1944) pp. 438-456. MR 0010611 (6:45a)

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-, Measure and area, Bull. Amer. Math. Soc. vol. 58 (1952) pp. 306-378. MR 0049289 (14:149e)

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E. J. Mickle, Lebesgue area and Hausdorff measure, Rend. Circ. Mat. Palermo, Series II, Tomo IV (1955) pp. 205-236. MR 0074497 (17:595e)

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T. Rado, Length and area, Amer. Math. Soc. Colloquim Publications, vol. 30, 1948. MR 0024511 (9:505g)

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-, Two-dimensional concepts of bounded variation and absolute continuity, Duke Math. J. vol. 14 (1949) pp. 587-608. MR 0022593 (9:231b)

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-, On essentially absolutely continuous plane transformations, Bull. Amer. Math. Soc. vol. 55 (1949) pp. 629-632. MR 0029975 (10:691c)

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-, On multiplicity functions associated with Lebesgue area, Rend. Circ. Mat. Palermo, Series II, Tomo IV (1955) pp. 219-236. MR 0074498 (17:595f)

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J. W. T. Youngs, A reduction theorem concerning the representation problem for Fréchet varieties, Proc. Nat. Acad. Sci. U.S.A. vol. 32 (1946) pp. 328-330. MR 0018219 (8:259a)