Clauss (M.), HIST. ZEIT., CCX, 1987, PP. 148- 149., German

1985 Teitler (Hans C.) NOTARII AND EXCEPTORES: AN INQUIRY INTO ROLE AND SIGNIFICANCE OF SHORTHAND WRITERS IN THE IMPERIAL AND ECCLESIASTICAL BUREAUCRACY OF THE ROMAN EMPIRE (FROM THE EARLY PRINCIPATE TO C. 450 A. D) IX- 380 P.