Finite-field method with unbiased polarizable continuum model for evaluation of the second hyperpolarizability of an open-shell singlet molecule in solvents. - Tomoya Inui; Yasuteru Shigeta; Katsuki Okuno; Takeshi Baba; Ryohei Kishi; Masayoshi Nakano (J. Comput. Chem., 2013)