Issue No.01 - January/February (1983 vol.3)
Mark Yerry , Rensselaer Polytechnic Institute
By allowing the use of quadrants with cut corners, this modeling technique overcomes some of the drawbacks of standard quadtree encoding for finite element mesh generation.
Mark Yerry, "A Modified Quadtree Approach To Finite Element Mesh Generation", IEEE Computer Graphics and Applications, vol.3, no. 1, pp. 39-46, January/February 1983, doi:10.1109/MCG.1983.262997