[1] D. D. Anderson and J. Kintzinger, Ideals in direct products of commutative rings, Bull. Austr. Math. Soc., 77 (2008) 477-483.
[2] M. F. Atiyah and I. G. Macdonald, Introduction to Commutative Algebra, Addison-Wesely, Reading Mass, 1969.
[3] F. Azarpanah, O. A. S. Karamzadeh and A. Rezaei Aliabad, On z◦-ideal in C(X), Fund. Math., 160 (1999) 15-25.
[4] F. Azarpanah, O. A. S. Karamzadeh and A. Rezaei Aliabad, On ideals consisting entirely of zero divisors, Comm. Algebra, 28 (2000) 1061-1073.
[5] F. Azarpanah and R. Mohamadian, √z-ideals and √z◦-ideals in C(X), Acta. Math. Sinica. English Series, 23 (2007) 989-996.
[6] A. Benhissi and A. Maatallah, A question about Higher order z-ideals in commutative rings, Quaest. Math., 43 (2020) 1155-1157.
[7] T. Dube and O. Ighedo, Higher order z-ideals in commutative rings, Miskolc Math. Notes, 17 No. 1 (2016) 171-185.
[8] R. Engelking, General Topology, PWN-polish Science Publication, Warsaw, Poland, 1977.
[9] L. Gillman and M. Jerison, Rings of Continuous Functions, Springer-Verlag, Berlin, Germany, 1976.
[10] S. Hizem, Chain conditions in rings of the form A + xB[x] and A + xI[x], J. Commut. Algebra, (2009) 259-274.
[11] I. Kaplansky, Commutative Rings, Allyn and Bacon, Boston, MA, USA, 1970.
[12] G. Mason, z-ideals and prime ideals, J. Algebra, 26 (1973) 280-297.
[13] A. Rezaei Aliabad and R. Mohamadian, On z-Ideals and z◦-Ideals of Power Series Rings, J. Math. Ext., 7 (2013) 93-108.
[14] Tlharesakgosi, B. Topics on z-ideals of Commutative Rings, University of South Africa, Pretoria, 2017.