The following paper is written by Fr. Richard Price.
Richard Price is Professor of the History of Christianity. MA (Oxford), DPhil (Oxford), BD (London), MTh (London).
More on his biography can be found here.
https://www.academia.edu/5371755/Presidency_and_Procedure_at_the_Early_Ecumenical_Councils
Ubi Petrus Ibi Ecclesia 
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