References
L. Cesari, «Variation, multiplicity and Semicontinuity,», American Mathematical Monthly, vol. 65 (1958), pp. 317–332.
P. C. Hammer and John C. Holladay, «Functions of Restricted Variation», Rendiconti del Circolo Mat. di Palermo—Serie II, vol. 8 pp. 102–114.
P. C. Hammer, «Maximal Convex Sets», Duke Math. Journal, vol. 22 (1955), pp. 103–106.
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Hammer, P.C. Syntonicity of functions and the variation functional. Rend. Circ. Mat. Palermo 8, 145–151 (1959). https://doi.org/10.1007/BF02851025
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DOI: https://doi.org/10.1007/BF02851025