1Gomes,G.M.S. and Howie,J.M.--On the ranks of certain finite semigroups of transformations,Math. Proc. Cambridge Phil. Soc. , 101 ( 1987 ) ,395 - 403.
2杨秀良.严格部分变换半群的幂等元秩[J].Journal of Mathematical Research and Exposition,2000,20(3):441-446. 被引量：4
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