Enhancement of sketch contours on paintings infrared photographies: A comparison. - Arnaldo de Albuquerque Araújo; Renato Moreira Hadad; Beatrix V. Coelho (EUSIPCO, 1998)

Using the Hough Transform to Detect Circular Forms in Satellite Imagery. - Renato Moreira Hadad; Paulo P. Martins Jr.; Arnaldo de Albuquerque Araújo (SIBGRAPI, 2001)