NFTU was asked to post the following paper on the subject of cessation of communion. The document was composed by the Romanian speaking Moldovan Non-Commemorator Brotherhood of St. Ignatius Brianchaninov [though seemingly inclined to True Orthodoxy].
Here is the document in pdf format
369539740-Breaking-Communion-With-Heretics-and-the-15th-Canon-I-II-Constantinople.
It may also be read on Scribd.