Google Scholardoi.orgA School Geometry Parts i and ii Experimental and Theoretical Course of Geometry Elementary Geometry Solid GeometryNature·1903·Vol. 68(1755), pp. 147–148Related Papers→ Five Years of Comparison Between Euclidian Plane Geometry and Spherical Geometry in Primary Schools: An Experimental Study(2021)4 cited→ 3. Non-Euclidean geometry(2022)4 cited→ The Molecular Geometry(2011)1 cited→ Spherical Geometry(1988)→ Hyperbolic geometry(2011)