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2. The productivity of several machines under the care of one operator;Ashcroft;R. Stat. Soc. J.,1950
3. The assignment of operators to service semi-automatic machines;Fetter;J. Industrial Engng,1955
4. Comments on simulation in the application of wage incentives to multiple machines;Burgess;J Industrial Engng,1962
5. On the cyclic servicing of semi-automatic machines;Conway;J. Industrial Engng,1962