MathSciNet bibliographic data MR419655 (54 #7673) 20M10 Hartfiel, D. J.; Maxson, C. J.; Plemmons, R. J. A note on Green's relations on the semigroup \$N\sb{n}.\$$N\sb{n}.$ Proc. Amer. Math. Soc. 60 (1976), 11–15 (1977). Article

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