Deupree, R. G.; R. K. Wallace (1987). “The core helium flash and surface abundance anomalies”. Astrophysical Journal317: 724-732. Bibcode: 1987ApJ...317..724D. doi:10.1086/165319.
Wood, P. R.; D. M. Zarro (1981). “Helium-shell flashing in low-mass stars and period changes in mira variables”. Astrophysical Journal247 (Part 1): 247. Bibcode: 1981ApJ...247..247W. doi:10.1086/159032.
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Deupree, R. G.; R. K. Wallace (1987). “The core helium flash and surface abundance anomalies”. Astrophysical Journal317: 724-732. Bibcode: 1987ApJ...317..724D. doi:10.1086/165319.
Wood, P. R.; D. M. Zarro (1981). “Helium-shell flashing in low-mass stars and period changes in mira variables”. Astrophysical Journal247 (Part 1): 247. Bibcode: 1981ApJ...247..247W. doi:10.1086/159032.