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Translated from Matematicheskie Zametki, Vol. 33, No. 3, pp. 365–383, March, 1983.
The author thanks S. B. Stechkin for suggesting the problem and discussion.
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Koshcheev, V.A. Chebyshev systems of continuous functions with values in two-dimensional strictly convex normed space. Mathematical Notes of the Academy of Sciences of the USSR 33, 186–195 (1983). https://doi.org/10.1007/BF01686325
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DOI: https://doi.org/10.1007/BF01686325