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Egri, Edith: Cauchy problem for a system of iterative functional-differential equations. An. Univ. Vest Timiş., Ser. Mat.-Inform. 46, No. 1, 23–49 (2008).
Egri, Edith; Rus, Ioan A.: First order iterative functional-differential equation with parameter. Stud. Univ. Babeş-Bolyai, Math. 52, No. 4, 67–80 (2007).
Sándor, J.; Egri, E.: Arithmetic functions in algebra, geometry and analysis. Adv. Stud. Contemp. Math., Kyungshang 14, No. 2, 161–213 (2007).
Rus, Ioan A.; Egri, Edith: Boundary value problems for iterative functional-differential equations. Stud. Univ. Babeş-Bolyai, Math. 51, No. 2, 109–126 (2006).