MathSciNet bibliographic data MR1135078 (93i:16020) 16G10 (16G70) Peng, Lian Gang; Xiao, Jie On the number of $D{\rm Tr}$$D{\rm Tr}$-orbits containing directing modules. Proc. Amer. Math. Soc. 118 (1993), no. 3, 753–756. Article

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