Gram determinantal inequalities with elements [rm] obtained from Hylleraas wave functions for the 2S states of the three-electron systems Li, Be+, Be2+, C3+, N4+, O5+, F6+, and Ne7+ - Csavinszky, Peter (Array, 1996)
Tenth international course and conference Math/Chem/Comp, Dubrovnik 1995