Here is something I posted on another forum. At the end of this message, you'll find a reference to Studer's work.
One of the most important works on the Trinity
doctrine is Novatian's _De Trinitate_. This work has
been admired in the western church and became somewhat
of a VADE MECUM in ancient times. In English, we
usually call Novatian's treatise _On the Trinity_.
However, one wonders whether Novatian himself appended
the word "Trinity" to the title of this document?
Alternatively, is it possible that early copies of the
text were edited or redacted and the word "Trinity"
was added to Novatian's work?
Russell J. DeSimone (in his translation of _De
Trinitate_) points out that we do not know the
original title of what is now known as _De Trinitate_.
He suggests that the "correct title" of the work
appears to have been _De regula veritatis_ or _De
regula fidei_ (DeSimone 23). The latter title may be
more likely in view of what Novatian writes in _De
Trinitate_ 21 regarding the general thesis of his
work. In any event, Novatian the Presbyter never
utilizes the term "Trinity." DeSimone thus notes that
an amanuensis living after 381 probably altered the
title in view of what transpired in 325 and 381 CE at
the ecumenical councils (DeSimone 23).
Joseph M. Hallman (_The Descent of God_, page 70)
similarly observes that _De regula fidei_ may have
been the original title of _De Trinitate_. Again, the
possible work of a redactor is acknowledged.
One may also find evidence for Trinitarian redaction
in the Latin versions of Origen's _Peri Archon_. See
Basil Studer's _Trinity and Incarnation_, page 84.