Authors: Birman, GS Ungar, AA

Citation: Gs. Birman et Aa. Ungar, The hyperbolic derivative in the Poincare ball model of hyperbolic geometry, J MATH ANAL, 254(1), 2001, pp. 321-333

Authors: Anchordoqui, LA Bergliaffa, SEP Trobo, ML Birman, GS

Citation: La. Anchordoqui et al., Cylindrically symmetric spinning Brans-Dicke space-times with closed timelike curves, MOD PHY L A, 14(17), 1999, pp. 1105-1111