Rituparna Das และ Binod Chandra Tripathy. (2016) Spectrum and fine spectrum of the lower triangular matrix B (r,s,t ) over the sequence space cs. <i>Songklanakarin Journal of Science and Technology (SJST)</i>, <i>38</i>(3), 265-274.Rituparna Das และ Binod Chandra Tripathy. "Spectrum and fine spectrum of the lower triangular matrix B (r,s,t ) over the sequence space cs". Songklanakarin Journal of Science and Technology (SJST) 38 (2016):265-274.Rituparna Das และ Binod Chandra Tripathy. Spectrum and fine spectrum of the lower triangular matrix B (r,s,t ) over the sequence space cs. Research and Development Office, Prince of Songkla University:ม.ป.ท. 2016.