Levy, D. E.; Myers, R. J. "Spectroscopic Determination of the Second Dissociation Constant of H2Se and the Activity Coefficients and Spectral Shifts of Its Ions" J. Phys. Chem.1990, 94(20), 7842-1847. http://pubs.acs.org/doi/pdf/10.1021/j100383a020
Bernd E. Langner "Selenium and Selenium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, 2005, Wiley-VCH, Weinheim. DOI:10.1002/14356007.a23_525.