@incollection{Li18,
author = {Kamal Shah and Yongjin Li},
title = {Existence Theory of Differential Equations of Arbitrary Order},
booktitle = {Differential Equations},
publisher = {IntechOpen},
address = {Rijeka},
year = {2018},
editor = {Terry E. Moschandreou},
chapter = {2},
doi = {10.5772/intechopen.75523},
url = {https://doi.org/10.5772/intechopen.75523}
}