Etymology for Byzantine Ketepano

Can somebody help me with the standard etymology for Ketepano ?

Hélène Ahrweiler [in "Recherches sur l'administration de l'empire byzantin
aux IXe-XIe siècles", published in "Bulletin de Corespondence Hellenique",
no. 84/1960, pg. 1-109] analyze this duke/ketepano problem [at pg. 64-67].
It seams that the same article was re-published in "Études sur les
structures administratives et sociales de Byzance", London [Variorum] 1971,
VIII.
Has anybody access to one of these works and is willing to help me with a
luck-up ?

Thank You,
S o r i n

P.S. A Byzantine THEME [themata; administration unit/military district in
the Byzantine Empire between 620-1204] was ruled by a duke or KETEPANO and a
civil governor [krites or protonotar]. The ketepano had military
attributions.