Barycentric calculus in Euclidean and hyperbolic geometry :a comparative introduction
Includes bibliographical references )pages 337-340( and index
Abraham Albert Ungar
Euclidean barycentric coordinates and the classic triangle centers -- Gyrovector spaces and Cartesian models of hyperbolic geometry -- The interplay of Einstein addition and vector addition -- Hyperbolic barycentric coordinates and hyperbolic triangle centers -- Hyperbolic incircles and excircles -- Hyperbolic tetrahedra -- Comparative patterns