Jost solutions and the spectrum of the system of difference equations. - Elgiz Bairamov; Cafer Coskun (Appl. Math. Lett., 2004)

The structure of the spectrum of a system of difference equations. - Elgiz Bairamov; Cafer Coskun (Appl. Math. Lett., 2005)

Non-selfadjoint matrix Sturm-Liouville operators with spectral singularities. - Murat Olgun; Cafer Coskun (Appl. Math. Comput., 2010)

Principal functions of non-selfadjoint matrix Sturm-Liouville equations. - Cafer Coskun; Murat Olgun (J. Comput. Appl. Math., 2011)