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