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[1] H. Sachs, Ebene isotrope schweig/Wiesbaden, 1987.
[2] I. M. Yaglom, Galilean principle of relativity and NonEuclidean geometry (in Russian), Nauka, Moscow, 1969.
[3] I. M. Yaglom, A Simple NonEuclidean Geometry and Its Physical Basis, Springer, 1979.