We comment on a recent paper [D. Schultz et al, Phys. REv. Lett. 90, 015501 (2003)]. We argue that a highly systematical investigation is needed to determine the most stable structures of both pristine and N-substituted fullerenes.
@article{arxiv.cond-mat/0301494,
title = {Comment on "Stability of Small Carbon-Nitride Heterofullerenes"},
author = {Guangyu Sun and Rui-Hua Xie and Mark C. Nicklaus},
journal= {arXiv preprint arXiv:cond-mat/0301494},
year = {2007}
}