@incollection{Tursunov17,
author = {Keldibay Alymkulov and Dilmurat Adbillajanovich Tursunov},
title = {Perturbed Differential Equations with Singular Points},
booktitle = {Perturbation Theory},
publisher = {IntechOpen},
address = {Rijeka},
year = {2017},
editor = {Dimo I. Uzunov},
chapter = {1},
doi = {10.5772/67856},
url = {https://doi.org/10.5772/67856}
}