A Method in Proportion to drawing ellipses in dimetric projection 正二测轴测图中椭圆的八点比例作图法
Study On The Oblique Dimetric Projection Of The Hyperconical Surface In Four-Dimensional Space And Its Orthographic Projections Upon The Four Three-Dimensional Projection Spaces E~4中二次锥型超曲面立体图及其在三维投影空间正投影图的研究