The guys at CalvinistInternational have done a decent job with the sources.
The Extra-Calvinisticum is the doctrine that Lutherans charged followers of Calvin for holding. For the record, I still side with the Lutherans on this, but that’s not the point. The point is that the extra-Calvinisticum is tied in with the Nestorian charge that people often throw at Calvinists. The problem–of which I was aware when I was attacking Calvinist Christology–is that many Greek fathers held to the extra-Calvinisticum, if the anachronistic use of the term can be excused. The quote by Athanasius is fairly common knowledge. The rest is from the guys at CalvinInter. Let’s keep in mind what the extra-calvinisticum is claiming. It is claiming that there is a bit of the Logos’ divine nature not contained inside the incarnate Person.
The Word was not hedged in by being present elsewhere as well. When He moved His body He did not cease also to direct the universe by His Mind and might. No. The marvellous truth is, that being the Word, so far from being Himself contained by anything, He actually contained all things Himself.
On the Incarnation 17
Now it is impossible for any creature to comprehend the Divine Essence, as was shown in the FP, Q12, AA1,4,7, seeing that the infinite is not comprehended by the finite. And hence it must be said that the soul of Christ nowise comprehends the Divine Essence.
John of Damascus, qtd in Thomas Aquinas, Third Part, Q10, A1.
To put this into perspective, let’s keep in mind the doctrine of en-hypostatization. Natures are contained within an hypostasis.