Please note that these files are scans and that downloads may take some time.
Peter Buneman. A Note on the Metric Properties of Trees. J. Combinatorial Theory (B), 17:48–50, 1974. (pdf scan - 3.4mb)
Peter Buneman. A Characterisation of Rigid Circuit Graphs. Discrete Mathematics, 9:205–212, 1974. (pdf scan -2.0mb)
Peter Buneman. The Recovery of Trees from Measures of Dissimilarity. In D.G. Kendall and P. Tautu, editors, Mathematics the the Archeological and Historical Sciences, pages 387–395. Edinburgh University Press, 1971. (pdf scan - 3.0mb)