@incollection{Alagappan15,
author = {G. Alagappan},
title = {Equal Frequency Surface},
booktitle = {Photonic Crystals},
publisher = {IntechOpen},
address = {Rijeka},
year = {2015},
editor = {Alireza Bananej},
chapter = {5},
doi = {10.5772/59887},
url = {https://doi.org/10.5772/59887}
}