@inproceedings{mikhail1995the,
title={The negative discrete spectrum of the operator (-τ)^{$l$}-α$V$in$L$_{2}($R$^{$d$}) for$d$even and 2$l$≥$d$in$L$_{2}($R$^{$d$}) for$d$even and 2$l$≥$d$},
author={Mikhail Sh. Birman, Ari Laptev, and Michael Solomyak},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203549828765675},
booktitle={Arkiv for Matematik},
volume={35},
number={1},
pages={87-126},
year={1995},
}
Mikhail Sh. Birman, Ari Laptev, and Michael Solomyak. The negative discrete spectrum of the operator (-τ)^{$l$}-α$V$in$L$_{2}($R$^{$d$}) for$d$even and 2$l$≥$d$in$L$_{2}($R$^{$d$}) for$d$even and 2$l$≥$d$. 1995. Vol. 35. In Arkiv for Matematik. pp.87-126. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203549828765675.