@inproceedings{e.1969graphs,
title={Graphs on unlabelled nodes with a given number of edges},
author={E. M. Wright},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203221028654103},
booktitle={Acta Mathematica},
volume={126},
number={1},
pages={1-9},
year={1969},
}