@incollection{Huang17,
author = {Jing Huang},
title = {Green Function},
booktitle = {Perturbation Theory},
publisher = {IntechOpen},
address = {Rijeka},
year = {2017},
editor = {Dimo I. Uzunov},
chapter = {3},
doi = {10.5772/68028},
url = {https://doi.org/10.5772/68028}
}