Бейсебай, П. ., and Г. . Мухамедиев. “ON THE CONSTRUCTION OF A FUNDAMENTAL SYSTEM OF SOLUTIONS OF A LINEAR HOMOGENEOUS DIFFERENTIAL EQUATION WITH CONSTANT COEFFICIENTS OF AN ARBITRARY ORDER”. Bulletin of Abai KazNPU. Series of Physical and Mathematical Sciences, vol. 70, no. 2, June 2020, pp. 53-58, doi:10.51889/2020-2.1728-7901.07 .