The systems of primitive roots the degree and rank of prime numbers. - Haralambos K. Terzidis; George Danas (Int. J. Comput. Math., 2000)

On the Computation of the GCD of 2-D Polynomials. - Panagiotis Tzekis; Nicholas P. Karampetakis; Haralambos K. Terzidis (Int. J. Appl. Math. Comput. Sci., 2007)