Das, Pratulananda, Kostyrko, Pavel, Wilczyński, Władysław and Malik, Prasanta. "I and I*-convergence of double sequences"
Mathematica Slovaca, vol. 58, no. 5, 2008, pp. 605-620.
https://doi.org/10.2478/s12175-008-0096-x
Das, Pratulananda, Kostyrko, Pavel, Wilczyński, Władysław and Malik, Prasanta. "I and I*-convergence of double sequences"
Mathematica Slovaca 58, no. 5 (2008): 605-620.
https://doi.org/10.2478/s12175-008-0096-x