Zhang Ping, Chen Lihui Document filters using morphological and geometrical features of characters. [Citation Graph (0, 0)][DBLP] Image Vision Comput., 2001, v:19, n:12, pp:847-855 [Journal]
Adel A. Sewisy, Franz Leberl Detection ellipses by finding lines of symmetry in the images via an hough transform applied to straight lines. [Citation Graph (0, 0)][DBLP] Image Vision Comput., 2001, v:19, n:12, pp:857-866 [Journal]