A generalization of the Riemann integral
-  E. H. Hanson, The -limit, Ph.D. Dissertation, The Ohio State University, 1934.
-  Stanisław Saks, Theory of the integral, Second revised edition. English translation by L. C. Young. With two additional notes by Stefan Banach, Dover Publications, Inc., New York, 1964. MR 0167578
-  E. Kamke, Zur Definition der approximativ stetigen Funktionen, Fund. Math. vol. 10 (1927).
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