Recognizable Picture Series. - Symeon Bozapalidis; Archontia Grammatikopoulou (J. Autom. Lang. Comb., 2005)

Picture codes. - Symeon Bozapalidis; Archontia Grammatikopoulou (RAIRO Theor. Informatics Appl., 2006)

An Eilenberg Theorem for Pictures. - Symeon Bozapalidis; Archontia Grammatikopoulou (CAI, 2009)