A local version of the Pawlucki-Plesniak extension operator. - Muhammed Altun; Alexander Goncharov (J. Approx. Theory, 2005)

Fine spectra of upper triangular double-band matrices. - Vatan Karakaya; Muhammed Altun (J. Comput. Appl. Math., 2010)

On the fine spectra of triangular Toeplitz operators. - Muhammed Altun (Appl. Math. Comput., 2011)

Fine Spectra of Tridiagonal Symmetric Matrices. - Muhammed Altun (Int. J. Math. Math. Sci., 2011)