Ross[1] characterized the maximum exp(PMSD_n,g,n) and extremal digraphs exp(PMSD_n,g,n) of the exponent of primitive minimally strong digraphs with n vertices and girth g.

• Ross刻划了围长为g的n阶本原极小强连通有向图的本原指数(n-指数)最大值exp(PMSD_(n,g),n)和极图(?)