Basu, S., Chaplin, W. J., Elsworth, Y., New, R., Serenelli, A. M., & Verner, G. A. (2007). Solar abundances and helioseismology: fine-structure spacings and separation ratios of low-degree p-modes. Astrophysical Journal, 655(1 Part 1), 660-671. doi:10.1086/509820.