no. 1
Prescribed ultrametrics
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 27 (1993) no. 1, pp. 1-5. 
@article{ITA_1993__27_1_1_0,
     author = {Higgins, J. and Campbell, D.},
     title = {Prescribed ultrametrics},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {1--5},
     publisher = {EDP-Sciences},
     volume = {27},
     number = {1},
     year = {1993},
     mrnumber = {1213417},
     zbl = {0786.54031},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1993__27_1_1_0/}
}
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Higgins, J.; Campbell, D. Prescribed ultrametrics. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 27 (1993) no. 1, pp. 1-5. http://www.numdam.org/item/ITA_1993__27_1_1_0/

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2. V. Z. Feinberg, Finite Ultrametric Spaces, Dokl. Akad. Nauk S.S.S.R., 1972, 202, pp. 775-778. | MR | Zbl

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