Citation: Aa. Ungar, Hyperbolic trigonometry and its application in the Poincare ball model of hyperbolic geometry, COMPUT MATH, 41(1-2), 2001, pp. 135-147
Citation: Aa. Ungar, Hyperbolic trigonometry in the Einstein relativistic velocity model of hyperbolic geometry, COMPUT MATH, 40(2-3), 2000, pp. 313-332