89) Electronic spectra of GdF reanalyzed by decomposing state functions according to 
f-shell angular momentum.
    S. Yamamoto and H. Tatewaki
    J. Chem. Phys. 134, 164310-1~11 (2011)

90) Necessity of including the negative energy space in four-component relativistic 
calculations.
    H. Tatewaki and Y. Watanabe
    Chem. Phys. Accepted (2011)