University of MaraghehSahand Communications in Mathematical Analysis2322-580704120161101On isomorphism of two bases in Morrey-Lebesgue type spaces799022226ENFatima. A.GuliyevaInstitute of Mathematics and Mechanics of NAS of Azerbaijan, Az1141, Baku, Azerbaijan.Rubaba H.AbdullayevaMath teacher at the school No 297, Baku, Azerbaijan.Journal Article20160210Double system of exponents with complex-valued coefficients is considered. Under some conditions on the coefficients, we prove that if this system forms a basis for the Morrey-Lebesgue type space on $left[-pi , pi right]$, then it is isomorphic to the classical system of exponents in this space.http://scma.maragheh.ac.ir/article_22226_0b34cf5e5a4f7c322ff3393fa083fff2.pdf