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References:
[1] Baer R.: The infinity of generalized hyperbolic plаnes. From "Studies аnd Essаys presented to Richаrd Courаnt on his 60th Birthdаy", New York 1948, pp. 21-27. MR 0023083
[2] Baer R.: Polarities in finite projective plаnes. Bull. Amer. Mаth. Soc. 52 (1946), pp. 77-93. MR 0015219
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