G. Nedungatt,
“The Covenanters of the Early Syriac Speaking Church”,
Orientalia Christiana Periodica, vol. 39, pp. 191–215, 419–444, 1973.
G. Nedungatt,
“The Authenticity of Aphrahat’s Synodal Letter”,
Orientalia Christiana Periodica, vol. 46, no. 1, pp. 62-88, 1980.