2nd GLOBAL CONFERENCE on BUSINESS, ECONOMICS, MANAGEMENT andTOURISM, 30-31 October 2014, Prague, Czech Republic, 30 - 31 Ekim 2014, cilt.23, ss.176-179, (Tam Metin Bildiri)
In this paper, extending the works of Milena Radnovi\'c and Serge Tabachnikov, we establish conditions for two different non-symmetric norms to define the same billiard reflection law.