2nd GLOBAL CONFERENCE on BUSINESS, ECONOMICS, MANAGEMENT andTOURISM, 30-31 October 2014, Prague, Czech Republic, 30 - 31 October 2014, vol.23, pp.176-179, (Full Text)
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.