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2. Some Results on the Tree Realization of a Distance Matrix;Simões Pereira,1967
3. Theorie der endlichen und unendlichen Graphen;Konig,1936
4. Bell Labs. Tech. Memorandum;Boesch;M. S. Thesis,1967
5. Investigation of Distance on a Linear Graph;Krum;M. S. Thesis,1967