Excerptiones de gestis Chalcedonensis concilii
From Clavis Canonum
The Excerptiones de gestis Chalcedonensis concilii are a highly selective and artly interpolated abbreviation of the acts of the Council of Chalcedon. They were attributed to Verecundus in the editio princeps, but as Zechiel-Eckes has argued convincingly, in fact were produced in the ninth century by the Pseudoisidorian forgers.
Zechiel-Eckes, Verecundus oder Pseudoisidor? Zur Genese der Excerptiones de gestis Chalcedonensis concilii, DA 56 (2000) pp. 413-446 http://www.digizeitschriften.de/main/dms/img/?PPN=PPN345858735_0056&DMDID=dmdlog40. - Harder, Pseudoisidor pp. 173-180.4