參考文獻 1 Ashcroft, H. (1950). Productivity of several machines under the care of one operative. Journal of the Royal Statistical Society, Series B, 12(1), 145–151 2 Benson, F., & Cox, D. R. (1951). Productivity of machines requiring attention at random intervals. Journal of the Royal Statistical Society, Series B, 13, 65–82 3 Mack, C., Murphy, T., & Webb, N. L. (1957). The efficiency of N machines unidirectionally patrolled by one operative when walking times and repair times are constant, Journal of the Royal Statistical Society, Series B, 19(1), 166–172 4 Benson, F., Miller, J. G. & Townsend, M. W. H. (1953) MACHINE INTERFERENCE: A Solution of some work–load problems arising when an operative has charge of more than one machine, Journal of the Textile Institute Transactions, 44:12, T619-T644