A. Papadopoulos, On Hilbert fourth problem [Архівовано 11 березня 2020 у Wayback Machine.], 1-43. Handbook of Hilbert geometry (A. Papadopoulos and M. Troyanov, ed.), European Mathematical Society, IRMA Lectures in Mathematics and Theoretical Physics, № 22 (2014), p. 460.
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A. Papadopoulos, On Hilbert fourth problem [Архівовано 11 березня 2020 у Wayback Machine.], 1-43. Handbook of Hilbert geometry (A. Papadopoulos and M. Troyanov, ed.), European Mathematical Society, IRMA Lectures in Mathematics and Theoretical Physics, № 22 (2014), p. 460.
