Venturi, V.
, Leo, P.
, Tiesinga, E.
, Williams, C.
and Whittingham, I.
(2003),
Purely-Long-Range Bound States of He (2s<sup>3</sup>S) + He(2p<sup>3</sup>P), Physical Review A (Atomic, Molecular and Optical Physics)
(Accessed April 18, 2025)