The length of the work period and the work curve.
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[1] A. G. Bills,et al. The quantitative set , 1929 .
[2] W. C. F. Krueger. The influence of amount limits and time limits upon the rate of work. , 1937 .
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[1] A. G. Bills,et al. The quantitative set , 1929 .
[2] W. C. F. Krueger. The influence of amount limits and time limits upon the rate of work. , 1937 .