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MR1272496 05C20
Roberts, Fred S.; Xu, Yong Hua On the optimal strongly connected orientations of city street graphs. IV. Four east-west avenues or north-south streets. Viewpoints on optimization (Grimentz, 1990; Boston, MA, 1991). Discrete Appl. Math. 49 (1994), no. 1-3, 331–356.
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