Pseudo-valuation and pseudo norm
Rendiconti del Seminario Matematico della Università di Padova, Tome 51 (1974), pp. 83-96. 
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     author = {Singh, Surjit},
     title = {Pseudo-valuation and pseudo norm},
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Singh, Surjit. Pseudo-valuation and pseudo norm. Rendiconti del Seminario Matematico della Università di Padova, Tome 51 (1974), pp. 83-96. http://www.numdam.org/item/RSMUP_1974__51__83_0/

[1] P.M. Cohn, An invariant characterization of pseudo valuation on a field, Cambridge Phil. Soc., 50 (1954), pp. 159-177. | MR 64027 | Zbl 0055.03202