Dr. KJ Drake works through the history of the doctrine known as the Extra-Calvinisticum in his book The Flesh of the Word: The Extra Calvinisticum from Zwingli to Early Orthodoxy (Oxford University Press, 2021. Although this is not a popularly discussed doctrine it drives at the heart of what the Reformers were debating in the early years of the Protestant Reformation. Dr. Drake provides a window into how the Reformers answered the question: “where is Christ after the resurrection?”
