Zhengxin Hou Wenquan Wang Jinghui Chu A Kind of 2D Isotropic Wavelet and Its Application in Image Primitive Detection. 123- 2002 11 Journal of Circuits, Systems, and Computers 2 http://dx.doi.org/10.1142/S0218126602000355 db/journals/jcsc/jcsc11.html#HouWC02