Conditions for a plane projective metric to be a norm. (English) Zbl 0255.50007
References:
[1] | Phadke, Canad. J. Math. 24 pp 312– (1972) · Zbl 0235.53048 · doi:10.4153/CJM-1972-026-7 |
[2] | DOI: 10.1007/BF01696764 · JFM 56.0631.01 · doi:10.1007/BF01696764 |
[3] | Busemann, The geometry of geodesics (1955) · Zbl 0112.37002 |
[4] | Busemann, A spectrum of mathematics pp 108– (1971) |
[5] | DOI: 10.1007/BF01454835 · JFM 55.1043.01 · doi:10.1007/BF01454835 |
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