Check out this legally free ebook:

  • Die Theologische Bedeutung der Epiklese in der syro-antiochenischen bzw. malankarischen Liturgie, von P.G. Thomas Paniker (Wurzburg: Augustinus-Verlag, 1993). Available at Internet Archive. [N.B., The index page states that it was translated into German by Prof. Dr. John Madey. The text in English, “The Theological Significance of Epiclesis in the Malankara Qurbono”, is available as appendix II on page 83 of Holy Qurbono in the Syro-Malankara Church: A Liturgical Study, by Fr.Givergis Paniker Karichal, available at Internet Archive.]