Team, S. “Spectrum and Fine Spectrumof Generalized Second Order Difference Operator ∆2uv on Sequence Space c0: Bijaya Laxmi Panigrahi, Parmeshwary Dayal Srivastava”. Thai Journal of Mathematics, vol. 9, no. 1, Apr. 2011, pp. 57-74, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/248.