In analogy with the case of MCD, and inspired by the CPP formulation of NSCD by Vaara et al., an SOS expression for the NSCD B K term of nucleus K and its connection to the residues of a quadratic response function has been derived. The approach used a nonrelativistic formulation where the orbital hyperfine interaction operator of nucleus K, a.k.a. the paramagnetic (nuclear) spin-(electron) orbit (PSO) operator, ĥpso