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References:
[1] Neuman F.: On a certain ordering of the vertices of a tree. Časop. pěst. mat. 89 (1964), 323-339. MR 0181587 | Zbl 0131.20901
[2] Sekanina M.: On an ordering of the set of vertices of a connected graph. PuЫ. Fac. Sci. Univ. Brno, No. 4 (1960), 137-141. MR 0140095 | Zbl 0118.18903
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