Spin-orbit effects in the ground X2Π state and two low-lying excited valence states B2Π and L′2Φ for NOY.F. Gao, M.J. Wan, X.G. Wu, X.W. Zeng and T. GaoEur. Phys. J. D, 64 2-3 (2011) 249-256DOI: https://doi.org/10.1140/epjd/e2011-20276-y